MyHaas Welcome,
!
Haas Tooling Guest Order History MyHaas/HaasConnect Sign In Register Haas Tooling My Account Order History Return History MyHaas/HaasConnect Sign Out Welcome, My Machines Latest Activity My Quotes My Account My Users Sign Out
Find Your Distributor
  1. Select Language
    1. English
    2. Deutsch
    3. Español - España
    4. Español - Méjico
    5. Français
    6. Italiano
    7. Português
    8. Český
    9. Dansk
    10. Nederlands
    11. Magyar
    12. Polski
    13. Svenska
    14. Русский
    15. Türkçe
    16. 中文
    17. Suomi
    18. Norsk
    19. الإنجليزية
    20. български
    21. Hrvatski
    22. Ελληνικά
    23. Română
    24. Slovenský
    25. Slovenščina
    26. 한국어
    27. 日本語
Search
  • machines Main Menu
    • Haas Vertical Mills Vertical Mills
      Vertical Mills
      Vertical Mills View All
      • Vertical Mills
      • VF Series
      • Universal Machines
      • VR Series
      • Pallet-Changing VMCs
      • Mini Mills
      • Mold Machines
      • Drill/ Tap/ Mill Series
      • Toolroom Mills
      • Compact Mills
      • Gantry Series
      • Extra-Large VMC
      • Desktop Mill
      • Mill Automatic Parts Loader
      • Compact Automatic Parts Loader
    • Product Image Multi-Axis Solutions
      Multi-Axis Solutions
      Multi-Axis Solutions View All
      • Multi-Axis Solutions
      • Y-Axis Lathes
      • 5-Axis Mills
    • Haas Lathes Lathes
      Lathes
      Lathes View All
      • Lathes
      • ST Series
      • Dual-Spindle
      • Toolroom Lathes
      • Chucker Lathe
      • Haas Bar Feeder V2
      • Lathe Automatic Parts Loader
    • Haas Horizontal Mills Horizontal Mills
      Horizontal Mills
      Horizontal Mills View All
      • Horizontal Mills
      • 50-Taper
      • 40-Taper
    • Haas Rotaries & Indexers Rotaries & Indexers
      Rotaries & Indexers
      Rotaries & Indexers View All
      • Rotaries & Indexers
      • Rotary Tables
      • Indexers
      • 5-Axis Rotaries
      • Extra-Large Rotaries
    • Product Image Automation Systems
      Automation Systems
      Automation Systems View All
      • Automation Systems
      • Robot Packages
      • Automatic Parts Loaders
      • Pallet-Pool Systems
      • Haas Bar Feeder
      • Models
    • QUICK LINKS Special Series  Special Series 
      HAAS CAREERS HAAS CAREERS BUILD & PRICE BUILD & PRICE PRICE LIST PRICE LIST WHAT’S NEW WHAT’S NEW YOUR FIRST CNC YOUR FIRST CNC HAAS SIX PACK HAAS SIX PACK
      SHOPPING TOOLS
      • Build & Price a Haas
      • Price List
      • Available Inventory
      • CNCA Financing
      WANT TO TALK TO SOMEONE?

      A Haas Factory Outlet (HFO) can answer your questions, and walk you through your best options.

      CONTACT YOUR DISTRIBUTOR >
  • Options Main Menu
    • Product Image Spindles
      Spindles
      Spindles View All
      • Spindles
    • Product Image Tool Changers
      Tool Changers
      Tool Changers View All
      • Tool Changers
    • Product Image 4th- | 5th-Axis
      4th- | 5th-Axis
      4th- | 5th-Axis View All
      • 4th- | 5th-Axis
    • Product Image Turrets & Live Tooling
      Turrets & Live Tooling
      Turrets & Live Tooling View All
      • Turrets & Live Tooling
    • Product Image Probing
      Probing
      Probing View All
      • Probing
    • Haas Chip & Coolant Management Chip & Coolant Management
      Chip & Coolant Management
      Chip & Coolant Management View All
      • Chip & Coolant Management
    • The Haas Control The Haas Control
      The Haas Control
      The Haas Control View All
      • The Haas Control
    • Product Image Product Options
      Product Options
      Product Options View All
      • Product Options
    • Product Image Tooling & Fixturing
      Tooling & Fixturing
      Tooling & Fixturing View All
      • Tooling & Fixturing
    • Product Image Workholding
      Workholding
      Workholding View All
      • Workholding
    • Product Image 5-Axis Solutions
      5-Axis Solutions
      5-Axis Solutions View All
      • 5-Axis Solutions
      • 5 Easy Steps to 5-Axis
    • Product Image Automation
      Automation
      Automation View All
      • Automation
    • QUICK LINKS Special Series  Special Series 
      HAAS CAREERS HAAS CAREERS BUILD & PRICE BUILD & PRICE PRICE LIST PRICE LIST WHAT’S NEW WHAT’S NEW YOUR FIRST CNC YOUR FIRST CNC HAAS SIX PACK HAAS SIX PACK
      SHOPPING TOOLS
      • Build & Price a Haas
      • Price List
      • Available Inventory
      • CNCA Financing
      WANT TO TALK TO SOMEONE?

      A Haas Factory Outlet (HFO) can answer your questions, and walk you through your best options.

      CONTACT YOUR DISTRIBUTOR >
  • Why Haas Main Menu
      Discover the Haas Difference
    • Why Haas
    • MyHaas
    • Education Community
    • Industry 4.0
    • Haas Certification
    • Customer Testimonials
  • Service Main Menu
      Welcome to Haas Service
      SERVICE HOME Operator’s Manuals How-To Procedures Troubleshooting Guides Preventive Maintenance Haas Parts Haas Tooling Videos
  • Videos Main Menu
  • Main Menu
    • View All
      • 5% off + saving on Automation
    • View All
      • VF-2SS
    • View All
    • View All
      • About Haas
    • View All
    • View All
      • 5% off + saving on Automation
    • View All
    • 08-1760
      08-1760
      08-1760 View All
      • 08-1760
    • View All
      • 05-0258
      • 08-1760
      • 08-1760
      • 08-1761
    • View All
    • View All
    • QUICK LINKS Special Series  Special Series 
      HAAS CAREERS HAAS CAREERS BUILD & PRICE BUILD & PRICE PRICE LIST PRICE LIST WHAT’S NEW WHAT’S NEW YOUR FIRST CNC YOUR FIRST CNC HAAS SIX PACK HAAS SIX PACK
      SHOPPING TOOLS
      • Build & Price a Haas
      • Price List
      • Available Inventory
      • CNCA Financing
      WANT TO TALK TO SOMEONE?

      A Haas Factory Outlet (HFO) can answer your questions, and walk you through your best options.

      CONTACT YOUR DISTRIBUTOR >
  • Haas Tooling Main Menu
      Mill Toolholding Mill Workholding Milling Lathe Tooling Lathe Toolholding Lathe Workholding ER Collets & Chucks Holemaking Threading Broaching Tool Management Tooling Accessories Abrasives Package Kits Apparel & Accessories Storage & Handling Measuring & Inspection
    • Haas Tooling
    • Mill Toolholding
      Mill Toolholding Shop All
      • End Mill Holders
      • Shell Mill Holders
      • Shrink Fit Holders
      • ER Collet Chucks
      • Milling Chucks & Collets
      • Drill Chucks
      • Pull Studs
      • Mill Toolholding Kits
      • Hydraulic Milling Chucks & Collets
    • Mill Workholding
      Mill Workholding Shop All
      • Fixed Jaw Vises
      • Self-Centering Vises
      • Adapter Plates
      • Mill Vise Jaws
      • Workholding Accessories
      • Vise Kits
      • Vise Parallels
      • HA5C Chucks
      • Rotary Vise Kits
      • Mill 3-Jaw Chucks & Mounts
    • Milling
      Milling Shop All
      • Shell Mill Bodies
      • Milling Inserts
      • End Mills
      • Chamfer Mills & Inserts
      • Indexable End Mill Bodies
      • Ball End Mills
      • Chamfer End Mills
      • Roughing End Mills
      • Indexable Ball End Mills & Inserts
      • Shell Mill Kits
      • Chamfer Mill Kits
      • Indexable End Mill Kits
      • Dovetail Cutters
      • Indexable Dovetail Cutters
      • Engraving End Mills
      • Burrs
      • Keyseat Cutters
      • Corner Rounding End Mills
    • Lathe Tooling
      Lathe Tooling Shop All
      • Cut-Off Tooling
      • Cut-Off Tooling Kits
      • Turning Inserts
      • Grooving Tools
      • Small ID Grooving & Threading Tools
      • Threading Inserts
      • Threading Toolholders
      • ID Toolholders
      • OD Toolholders
      • Cermet Turning Inserts
      • CBN Turning Inserts
      • Haas Notch Groove and Thread Inserts
      • Haas Notch Groove and Thread Toolholders
    • Lathe Toolholding
      Lathe Toolholding Shop All
      • TL & CL Toolholding
      • BOT Toolholding
      • BMT Toolholding
      • Live Toolholding
      • Reduction Sleeves
      • VDI Toolholding
    • Lathe Workholding
      Lathe Workholding Shop All
      • Live Centers
      • Spindle Liners
      • Quick-Change Collets
      • Lathe Collet Chucks
      • 5C Collets
      • 5C Collet Sets
      • Lathe Boring Rings
      • Lathe Jaws
    • ER Collets & Chucks
      ER Collets & Chucks Shop All
      • ER Collets
      • ER Sealed Collets
      • ER Tap Collets
      • ER Collet Sets & Accessories
      • ER Collet Chucks
      • Straight Shank ER Collet Chucks
      • Straight Shank Keyless Drill Chucks
    • Holemaking
      Holemaking Shop All
      • Carbide Drills
      • Indexable Drill Bodies
      • Indexable Drill Inserts
      • Modular Drill Bodies
      • Modular Drill Heads
      • Cobalt Drills & Sets
      • Center Drills
      • Reamers
      • Indexable Drilling Kits
      • Spot Drills
      • Spade Drill Bodies
      • Spade Drill Inserts
      • Countersinks
    • Threading
      Threading Shop All
      • Taps
      • Threading Inserts
      • Threading Toolholders
      • Thread Mills
      • Pipe Taps
      • Drill Tap Kits
    • Broaching
      Broaching Shop All
      • Broaching Toolholders
      • Broaching Inserts
    • Tool Management
      Tool Management Shop All
      • Tool Presetting Machines
      • Shrink Fit Machines
    • Tooling Accessories
      Tooling Accessories Shop All
      • Spindle Taper Cleaner
      • Haas Shop Lift
      • Toolholder Fixtures
      • CNC Clearing Fans
    • Abrasives
      Abrasives Shop All
      • Abrasive Pads
      • Deburr Tools
      • Deburr Wheels
    • Package Kits
      Package Kits Shop All
      • Chip Clearing Fan Kits
      • Cutting Tool Kits
      • Indexable End Mill Kits
      • Cut-Off Tooling Kits
      • Drill Tap Kits
      • Indexable Drilling Kits
      • Shell Mill Kits
      • Chamfer Mill Kits
      • Mill Toolholding Kits
      • Lathe Tooling Kits
      • Workholding Kits
      • Rotary Vise Kits
      • Vise Kits
      • Mill 3-Jaw Chuck Kits
      • Reduction Sleeve Kits
    • Storage & Handling
      Storage & Handling Shop All
      • Tool Carts
    • Measuring & Inspection
      Measuring & Inspection Shop All
      • 7-Piece Measuring Kit
      • WIPS Stylus, 3-Pack
      • WIPS Replacement Stylus
      • Spindle Test Bar
      • Coolant Refractometer
      • Clamp Force Gauge
    • Apparel & Accessories
      Apparel & Accessories Shop All
      • Accessories
      • Apparel
    • HAAS TOOLING QUICK LINKS
      NEW PRODUCTS NEW PRODUCTS
      MOST POPULAR MOST POPULAR
      TOOLING PROMOS TOOLING PROMOS
      FINANCING & OPEN TERMS FINANCING & OPEN TERMS
      FAQs FAQs
      KITS CREATED FOR YOU KITS CREATED FOR YOU
  • Haas Service Parts Main Menu
      Automatic Pallet Changer Lathe Turret Tool Changer Chip Management Coolant Counterbalance Electrical Cabinet Enclosure Hydraulics Lubrication Maintenance Pendant Probing Rotary Spindle Tailstock
    • Haas Service Parts
    • Automatic Pallet Changer
      Automatic Pallet Changer Shop All
      • HMC - Automatic Pallet Changer
      • VMC - Automatic Pallet Changer
    • Lathe Turret
      Lathe Turret Shop All
      • Lathe - Turret
      • Live Tooling
    • Tool Changer
      Tool Changer Shop All
      • Side Mount
      • Umbrella
    • Chip Management
      Chip Management Shop All
      • Multi Auger
      • Single Auger
    • Coolant
      Coolant Shop All
      • Auxiliary Filter
      • HPC-300 (Lathe)
      • HPC-1000 (Lathe)
      • Oil Skimmer
      • Standard Coolant
      • TSC-300 (Mill)
      • TSC-1000 (Mill)
      • Coolant Refill
      • Loc-Line
    • Counterbalance
      Counterbalance Shop All
      • Charge & Discharge Hose
    • Electrical Cabinet
      Electrical Cabinet Shop All
      • Fans
      • Filters
      • Upgrade Kits
    • Enclosure
      Enclosure Shop All
      • Accessories
      • Air Nozzle
      • Decals
      • Door Bumpers
      • Lighting
      • Windows, Gaskets, & Weather Strip
      • Chip & Coolant Management
    • Hydraulics
      Hydraulics Shop All
      • Filters
      • Gauges
      • Heat Exchanger
      • Hoses
    • Lubrication
      Lubrication Shop All
      • Bijur Mechanical Lubrication
      • Minimum Lubrication
    • Maintenance
      Maintenance Shop All
      • Grease, Oil, & Sealants
    • Pendant
      Pendant Shop All
      • Floppy Disk & USB
      • Keypad
      • Keys
      • Lens
      • Gaskets & Seals
    • Probing
      Probing Shop All
      • Mill Probing
      • Lathe Tool Presetter
    • Rotary
      Rotary Shop All
      • Rotary Gaskets & Seals
    • Spindles
      Spindles Shop All
      • Couplings
      • Gaskets & Seals
      • Spindle Motor Drive
      • Gearbox Drive
      • Tool Release Piston
    • Tailstock
      Tailstock Shop All
      • Handles
  • Contact Us

×

Search Results

Web Pages

Images

    • <
    • 1
    • >
MyHaas Welcome,
!
Haas Tooling Guest Order History MyHaas/HaasConnect Sign In Register Haas Tooling My Account Order History Return History MyHaas/HaasConnect Sign Out Welcome, My Machines Latest Activity My Quotes My Account My Users Sign Out
Find Your Distributor
  1. Select Language
    1. English
    2. Deutsch
    3. Español - España
    4. Español - Méjico
    5. Français
    6. Italiano
    7. Português
    8. Český
    9. Dansk
    10. Nederlands
    11. Magyar
    12. Polski
    13. Svenska
    14. Русский
    15. Türkçe
    16. 中文
    17. Suomi
    18. Norsk
    19. الإنجليزية
    20. български
    21. Hrvatski
    22. Ελληνικά
    23. Română
    24. Slovenský
    25. Slovenščina
    26. 한국어
    27. 日本語
Search
×

Search Results

Web Pages

Images

    • <
    • 1
    • >

Hydraulic Power Unit - Troubleshooting Guide

Service Home Hydraulic Power Unit - Troubleshooting Guide
Recently Updated Last updated: 08/15/2022

Hydraulic Power Unit - Troubleshooting Guide


Hydraulic Power Unit - Troubleshooting Guide

Jump to Section 1. Introduction 2. Symptom Table 3. Oil Leaks 4. Solenoids 5. Settings 6. Air Leaks/Pickup Tube 7. Oil Pressure 8. Oil Level 9. Fans 10. Filters 11. Adjusting Valves 12. Coolant Contamination 13. Tank Reconfiguration 14. Electrical Phasing 15. Damaged Gauges 16. Electrical Diagram Back to Top

Download and fillout the hydraulic power unit Inspection Report Checklist below before replacing any parts.

Hydraulic Power Unit Inspection Report Checklist

Introduction

A: Haas HPU for most lathes made before 2016.

B: Haas HPU for most lathes made after 2016.

 Note: Not all lathes will have all of the components shown.

  1. Hydraulic pump
  2. Chuck and Tailstock pressure adjustment valves
  3. Chuck and Tailstock pressure gauges
  4. Oil fill cap
  5. Oil dip stick/Oil sight glass
  6. Solenoids
  7. Pressure filter
  8. Intake screen
  9. Pressure sensor
  10. Heat exchanger (can be mounted remotely, with or without fans)
  11. Cooling fans
  12. Return filter

Symptom Table

Symptom Possible Cause Corrective Action
Oil leaks The hoses are split or the fittings are loose. Tighten the fittings or replace the hoses.
The oil tank overflows. Diagnose the cause and drain the oil to the correct level.
Coolant contaminated the oil. Check the coolant collector for blockage.
Chuck or tailstock does not operate correctly. Or incorrect chuck or tailstock clamp force or pressure. The solenoid system does not operate correctly. Troubleshoot the system.
There are air bubbles in the oil. Reduce the clamp force, RPM, or duty cycle.
Inspect for oil leaks on the intake pipe.
Re-configure the return and pick-up pipes.
The oil level is low. Fill the HPU to the correct oil level.
A filter is clogged. Check the pressure filter and the intake screen for clogs.
The adjustment valve is contaminated. Open the adjustment valve to purge the system.
Coolant contaminated the oil. Check the coolant collector for blockage.
Pressure fluctuates wildly. Pump oscillates and vibrates. Or noisy There are air bubbles in the oil. Reduce the clamp force, RPM, or duty cycle.
Inspect for oil leaks on the intake pipe.
Re-configure the return and pick-up pipes.
The oil level is low. Fill the HPU to the correct oil level.
The fans do not operate. Make sure the fans operate.
Coolant contaminated the oil. Check the coolant collector for blockage.
Overheating. Check for signs of overheating.
A filter is clogged. Check the pressure filter and the intake screen for clogs.
The HPU pump needs adjustment. Contact your local Haas Factory Outlet. Refer to the Lathe - Hydraulic Power Unit - Nachi Pump Adjustment. Do not replace the pump.
Overheating The oil level is low. Fill the HPU to the correct oil level.
The fans do not operate. Make sure the fans operate.
There are air bubbles in the oil. Reduce the clamp force, RPM, or duty cycle.
Setting 216 is not enabled. Enable Setting 216.
A filter is clogged. Check the pressure filter and the intake screen for clogs.
Low or no hydraulic pressure. Incorrect power phasing - the pump motor is running backward. Check the phasing indicators and change the incoming power cables, if necessary.
The Tailstock pressure does not adjust. The Tailstock Rapid Solenoid is engaged on an ST-10/15. Make sure that the Tailstock Rapid solenoid is not engaged when you adjust the Tailstock pressure. Press [RESET] twice after you release [EMERGENCY STOP].
The Programmable Pressure Motor does not turn.  
Pressure does not adjust or irregular changes in pressure. The pressure valve is bent or damaged. Replace the damaged adjustment valve.
Damaged pressure gauge. Snubber screw has backed out. Remove the gauge, install the snubber set screw, install new gauge.
Lathe HPU circuit breaker trips intermittently during normal operation. 10A circuit breaker is too small. Replace the 10A breaker with a 15A breaker. Only replace the breaker after all other causes have been checked and eliminated. Refer to the PSUP PCB Troubleshooting Guide.
Tailstock pressure stays at max PSI. The adjustment valve does not change the pressure. The Tailstock Rapid Solenoid is engaged. Troubleshoot the Tailstock Rapid solenoid.
The pressure gauge comes up to pressure slowly or low pressure alarms are generated. This is due to cold oil and/or a lower pressure setting. 

Allow more time for the pressure gauge to adjust.

Note: There is a long set screw snubber in the manifold behind the gauge and a 10 micron sintered bronze snubber in the gauge. These components protect gauges from failing during large pressure changes and slow the pressure gauge’s response to pressure changes or coming up to pressure from idle. These pressure changes are happening quicker at the chuck or tailstock then at the gauge or gauge page. The higher the pressure and warmer the oil, the faster the gauges will respond to pressure changes.

Alarm 9505 or 9505.001 COMMANDED PRESSURE NOT REACHED The commanded device pressure was not reached within the specified timeout.  Check electrical connections to the pressure switch or motor or for failed hardware such as the pressure valve, hydraulic motor, or coupler. See the Programmable Pressure Adjustment Valve - Troubleshooting Guide for more information.

Oil Leaks

Corrective Action:

If the oil tank overflows, find the cause, and fill the oil to the correct level. If the oil is contaminated with coolant, drain and replace the oil (refer to the Coolant Contamination section).

Make sure the hoses are routed correctly [4] and are secure. Tie them together with zip ties [3]. Damage can occur to the hoses if they rub [1] against other components, have sharp bends, or are kinked [2]. Replace the hoses if they are damaged.

Check the condition of the hydraulic hose fittings: Look for leaks at both ends of the hose. If a leak is found, try tightening the fittings. Refer to Lathe - Hydraulic Power Unit (HPU) - Hoses and Fittings - Maintenance. If a fitting has cracks [5], wear, continues to leak, the hose must be replaced.

Do not over-tighten the fittings.

Solenoids

Corrective Action:

It is normal for the solenoids to be hot to the touch. Check the voltage to the solenoid.

  1. Pull the solenoid connectors partially apart so you can access the leads with your needle-tip probes while the solenoid is connected.
  2. With the chuck or tailstock in operation, measure the voltage to the solenoid. The measured voltage must be 120 VAC.

If there is no voltage, refer to these troubleshooting guides:

  • NGC - I/O PCB - Troubleshooting Guide
  • CHC - I/O PCB - Troubleshooting Guide

If the solenoid receives voltage, but it does not operate correctly, clean the valve:

  1. Power off the machine.
  2. Remove the solenoid valve. Use compressed air to clean the solenoid valve.
  3. Reinstall the solenoid valve.
  4. Test for correct operation.

 Caution: Do not lose the (4) o-rings when you reinstall the solenoid valve.

Settings

Corrective Action:

Make sure Setting 216 SERVO AND HYDRAULIC SHUTOFF is set to (120) seconds or less. Do not have this setting set to (0), the HPU will not turn off, and will create unwanted air bubbles and heat. This setting will power-down the HPU when the machine is idle. This helps dissipate the air bubbles in the oil.

Machines with the Classic Haas Control with software version 11.27A or higher and all Next Generation Control machines do not allow you to set this setting to (0). The limits on this setting for these machines are 10 seconds to 99 minutes.

Air Leaks/Pickup Tube

Corrective Action:

Check for oil leaks at the intake pipe [1]. If there are leaks, clean the threads on the intake pipe [1]. Reapply thread sealant, and install the intake pipe [1].

If the symptom persists, go to the Tank Reconfiguration section to reconfigure the pipes.

Oil Pressure

Corrective Action:

Always make sure the oil level is correct and the filter is clean (refer to the Oil Level section and the Filter section).

Push [EMERGENCY STOP]. Wait half an hour while the air and oil separate. Resume machine operation. Check if the normal pressure returns while the operation resumes. If the symptom occurs again:

  • Reduce the hydraulic clamp pressure by about 25 PSI to reduce the rate of the hydraulic union leak at the slip joint.
  • Reduce the cycle time with higher feed rates.
  • Reduce the spindle RPM.

 Caution: Do not add anti-foaming agents. These agents are already present in the HPU oil.

Note: If low pressure alarms are generated or the hydraulic pressure gauge comes up to pressure very slowly, it can be due to cold oil and/or a lower pressure setting. There is a long set screw snubber in the manifold behind the gauge and a 10 micron sintered bronze snubber in the gauge. These components protect gauges from failing during large pressure changes and slow the pressure gauge’s response to pressure changes or coming up to pressure from idle. These usually happen when the tailstock is reversing direction. These pressure changes are happening quicker at the chuck or tailstock then at the gauge or gauge page. The higher the pressure and warmer the oil, the faster the gauges will respond to pressure changes.

Maximum Chuck Operating Pressures
Type psi Bar
5" Chuck 330 23
6" Chuck 330 23
8" Chuck, 2" Bore 330 23
8" Chuck, 2.5" Bore 260 18
10" Chuck 330 23
12" Chuck, 3" Bore 400 28
12" Chuck, 4" Bore 250 17
15" Chuck 340 23
18" Chuck 300 21

Oil Level

Corrective Action:

Check the gauge [1] or dipstick [2] to make sure that the HPU has enough oil. If the oil level is low, check for a leak. If there is a leak, repair the leak. Refill the oil.

Fans

Corrective Action:

If the HPU oil overheats: Some HPU assemblies have fans installed on the back. Make sure the fans operate when the spindle is in operation.

Make sure the spindle motor fan operates.

If the machine has a heat exchanger, make sure the heat exchanger is clean and its fan operate correctly. Not all heat exchangers have a separate fan. Some machines have remotely-mounted heat exchangers with integral fans.

The spindle fan on machines with the Classic Haas Control with software version 11.27A or higher and all Next Generation Control machines must stay on when the HPU is on.

Filters

Corrective Action:

Clean or replace the pressure filter [1] on the pump assembly. Make sure the intake filter [2] is not clogged. Clean it if necessary.

Test the hydraulic components for the correct pressure.

Adjusting Valves

Corrective Action:

Check the adjustment valve for debris: With the HPU powered on, open and close the adjustment valve fully to flush any contamination out. Power off the HPU and remove the adjustment valve. Inspect the o-rings for damage. Damaged o-rings can also cause incorrect pressure.

If the adjustment valve is damaged, replace it. For adjustment valve replacement instructions, refer to the ST/DS Lathe - Chuck and Tailstock Pressure Adjusting Valve - Replacement procedure.

Note: A bent or damaged valve can prevent pressure adjustment or irregular changes in pressure.

An ST-10/15 can have the Rapid Tailstock solenoid engaged when the tailstock is not in use. Press [RESET] twice after you release [EMERGENCY STOP] to disengage the solenoid and the pressure can be adjusted.

Coolant Contamination

Corrective Action:

Find the coolant return line under the spindle. If chips block the coolant return line, coolant floods into the hydraulic union and will contaminate the HPU oil and cause it to foam. It can also cause the tank to overfill.

Unclogg the coolant return line.

Drain the HPU and blow shop air through the hoses. Clean or replace all HPU filters. Clean the HPU and refill it with new oil. Cycle the chuck and tailstock several times. Check the oil again.

Tank Reconfiguration

Corrective Action:

Reconfigure the return and pick-up pipes to separate them. This gives the oil more time to dissipate the bubbles.

Remove the elbow fitting [1] from the intake line [2] and the intake filter [3]. Install the new intake screen [4] (Haas P/N 58-1832) on a new nipple (available locally). The new nipple length must be long enough so the new intake screen [4] is 1/4" from the bottom of the tank.

Remove the return line [5] from the return drain [6]. Install an elbow fitting [7] between the return line [5] and the return drain [6]. Install a new pipe nipple (available locally) to the elbow fitting [7] that reaches approximately 1" from the side of the tank.

Electrical Phasing

Corrective Action:

The power supply PCB has a phase detect with neon indicators on the top center portion of the board. Make sure that the electrical power is phased correctly:

  • Green Light: The incoming power is phased correctly.
  • Orange Light: The incoming power is incorrectly phased.
  • Both Lights: A phase is missing (there is a loose cable in the system).

If the electrical power is phased incorrectly:

Set the main circuit breaker to the OFF position.

Lock the main circuit breaker. Use an approved lock with an approved safety tag.

Swap the #74 and #75 incoming power cables at the main transformer.

Damaged Gauges

Corrective Action:

Damaged gauges may include: Displaying incorrect pressure, broken needles, not returning to 0 PSI when off, ect.

Remove the pressure gauge and check that the snubber set screw [1] has not backed out. The snubber set screw is similar to the Haas Liquid Grease restrictor fitting. Re-install the snubber set screw without any thread locker. Replace the gauge as needed.

Haas Lathe Hydraulic Power Unit (HPU) Troubleshooting

In this Haas Service Video, Haas Service Engineer Andrew Harnett walks you through how to troubleshoot an HPU on a Haas ST lathe. If your HPU is noisy and pressure is fluctuatiing, before you assume the unit is bad you need to see this video.

WARNING: You should not do mechanical or electrical machine repairs or service procedures unless you are qualified and knowledgeable about the processes.

WARNING: Only authorized personnel with the proper training and certification should do this repair procedure.

All information herein is provided as a courtesy for Haas machine owners for reference and illustrative purposes only. Haas Automation cannot be held responsible for repairs you perform. Only those services and repairs that are provided by authorized Haas Factory Outlet distributors are guaranteed.

Electrical Diagram

FIND DISTRIBUTOR
Feedback
Haas Logo

美元价格不包括关税、报关费用、保险费、增值税及运费。
USD prices DO NOT include customs duty, customs fees, insurance, VAT, or freight.

人民币价格包含关税、报关费用、货运保险和增值税, 但不包括运费。
CNY prices include customs duty, customs fees, insurance, and VAT. DOES NOT include freight.

Haas Delivered Price

This price includes shipping cost, export and import duties, insurance, and any other expenses incurred during shipping to a location in France agreed with you as a buyer. No other mandatory costs can be added to the delivery of a Haas CNC Product.

KEEP UP WITH THE LATEST HAAS TIPS AND TECHNOLOGY...

Sign up now!   

HAAS TOOLING ACCEPTS THE FOLLOWING:

  • Service & Support
  • Owners
  • Request Service
  • Operator Manuals
  • Haas Parts
  • Rotary Repair Request
  • Pre-Install Guides
  • Shopping Tools
  • Build & Price a New Haas
  • Available Inventory
  • The Haas Price List
  • CNCA Financing
  • About Haas
  • Careers
  • Certifications & Safety
  • Contact Us
  • History
  • Terms & Conditions
  • Haas Tooling Terms & Conditions
  • Privacy
  • Warranty
  • Haas Community
  • Haas Certification Program
  • Haas Motorsports
  • Gene Haas Foundation
  • Haas Technical Education Community
  • Events
  • Join the Conversation
  • Facebook
  • Twitter
  • Flickr
  • YouTube
  • LinkedIn
  • Instagram
  • TikTok
© 2023 Haas Automation, Inc – CNC Machine Tools

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.


2800 Sturgis Rd., Oxnard, CA 93030 / Toll Free: 800-331-6746
Phone: 805-278-1800 / Fax: 805-278-2255

Cookie Notice

We use cookies to improve your user experience. Our Cookie Notice describes which cookies we use, why we use them, and how you can find more information about them. Please confirm you consent to us using analytics cookies. If you do not consent, you may still use our website with a reduced user experience.

Manage Settings

Cookie Notice

We use cookies to improve your user experience. Our Cookie Notice describes which cookies we use, why we use them, and how you can find more information about them. Please confirm you consent to us using analytics cookies. If you do not consent, you may still use our website with a reduced user experience.

Functional Cookies

Analytics Cookies