50-taper Gearbox

1. Gearbox oil pump
2. High/low gear proximity sensors or mechanical switches
3. Spindle encoder
4. Spindle drive belts

Anti-Siphon Solenoid Lubrication Components:

• Oil-pump motor [1].
• Gearbox [2].
• Scavenge Line [3].
• Oil Flow Sensor [4].
• Filter [5].
• Oil Pump [6].
• Reservoir [7].
• Lubrication Tube [8].
• Oil Nozzle [9].
• Anti-siphon Solenoid [10].
• Vent Restrictor Orifice [11].
• Oil Level Switch [12].
• Air Vent [13]

• Solenoid activates and closes the vent [13].
• Pump pressurizes the system and allows oil to flow through.
• When the pump stops the solenoid deactivates and the vent opens up and allows air to flow from the gearbox.
• This allows bubbles/air into the output line [8] and breaks the natural siphon that would otherwise drain all the oil into the gearbox which will leak out of the main output shaft on to of the pulley.

50-taper spindle:

• Oil-pump motor [1]
• Oil Flow Switch [2]
• Scavenge Line [3]
• Oil Fill Hole Plug[4]
• Oil Filter [5]
• Oil Pump [6]
• Oil Level Switch [7]
• Lubrication Tube [8]
• Oil Nozzle [9]
• Orifice [10]
• Oil Reservoir [11]

Part Number Callouts:

• [1] - PN: 58-3691
• [2] - PN: 58-3618 (Needs to be ordered)
• [3] - PN: 59-1652
• [4] - PN: 58-3001
• [5] - PN: 58-1349
• [6] - PN: 58-2259
• [7] - PN: 58-1441
• [8] - PN: 58-0039
• [9] - PN: 58-3618

Remove the solenoid [1] and the 0.010" and 0.03." orifices [2] from the oil tank assembly, and replace them with a 0.020" orifice [3] P/N 58-0297.

Install a muffler [4] P/N 58-1861 on the gearbox housing as shown on the image. 

Note: If the gearbox was equipped with a antisiphon solenoid there was a hose going to this port on the housing. 

Follow the instuctions on the reservoir decal to refill the tank.

PRESSURIZED OIL TANK (5PSI) FILL/TOP-OFF INSTRUCTIONS

1. Remove the fill plug and set aside.

2. Run the oil pump for one minute in MDI M59 P1107; for CHC machines.

3. If necessary, fill tank to top of fill plug with Mobil SHC627 or Mobil 1 15W-50.

4. Replace the fill plug securely and clean off all oil residue.

5. Run the spindle for 10 minutes and check for oil leaks; repair as necessary.

Corrective Action:

• Fix the leaks.
• Fill/Top off oil.

50 Taper Gearbox:

1. Remove fill plug and set aside.
2. Run spindle at 500 RPM for apprx. one minute then stop.
3. If necessary, fill tank to top of fill plug with Mobil SHC627 or Mobil 1 15W-50.
4. Replace fill plug securely and clean off all oil residue.

Machines with a reservoir: Add 17 oz (500 ml) of Mobil SHC 627 transmission oil to the reservoir. Some machines have the reservoir near the spindle fan [1]. Other machines have the reservoir mounted on the sump tank [2]. Remove the spindle head covers to get access to it.

 Caution: Do not add more than 500 ml of oil at a time. The plastic reservoir wil completely empty the oil into the gearbox.

1. Fittings
2. Retention clip
3. Steel ball
4. Oil flow sensor housing
5. Proximity sensor

Corrective Action:

Remove the oil flow sensor from the oil-pump assembly. Use a screw driver to manually operate the switch. Navigate to the I/O tab in DIAGNOSTICS. Make sure the diagnostic bit for Low Lube Press. changes from 0 to 1.

 Note: The name of this diagnostic bit in older software versions is Low GB Oil Flow.

If the diagnostic bit for Low Lube Press. does not change from 0 to 1, disconnect the oil flow sensor from the connector bracket. Put an electrical jumper across the (2) pins in the connector for the oil flow sensor [1]. Make sure the diagnostic bit for Low Lube Press. changes from 0 to 1. If the input changes, the oil flow proximity sensor is faulty.

If the diagnostic bit for Low Lube Press. does not change from 0 to 1, disconnect the cable from the P12 connector [2] on the I/O PCB. Put an electrical jumper across pins 2 and 3 of the P12 connector. Make sure the diagnostic bit for Low Lube Press. changes from 0 to 1. If the input changes, the 950 cable is defective. If the input does not change, troubleshoot the I/O PCB.

Check the pressure switch with a voltmeter when the pump is running. If the switch is open (O.L.) when there is pressure in the system, replace it.

Corrective Action:

Remove the oil-level switch from the gearbox. While you move the float from position [2] to position [1], measure for continuity across pins 2 and 4 of the connector for the oil-level switch.The oil-level switch operates correctly when:

• There is not continuity when the magnet is at position [2].
• There is continuity when the magnet is at position [1].

Replace the oil-level switch if it does not operate correctly.

Disconnect the 950 cable from the P12 connector on the I/O PCB. Measure for continuity across pins 1 and 3 of the connector for the oil-level switch on the 950 cable. If there is continuity, there is a short circuit in the 950 cable. Replace the cable.

Put an electrical jumper across pins 1 and 3 of the P12 connector. Press [PARAM/DGNOS] twice. Navigate to the I/O tab. Make sure the diagnostic bit for Low GB Oil Level changes from 1 to 0. If the input does not change, troubleshoot the I/O PCB.

Corrective Action:

Put a wrench [2] on the straight male-fitting [1] to make sure it does not move. With another wrench [3], turn the hose and the barbed fitting [4] counterclockwise to remove them.

Put a wrench [6] on the inlet-screen housing [5] to make sure it does not move. With another wrench [7], turn the straight male-fitting [8] counterclockwise to remove it.

Remove the spring [1] and the inlet screen [2] from the inlet-screen housing [3]. Clean the inlet screen [4]. Reinstall the inlet screen.

Corrective Action: Troubleshoot the oil-pump motor.

Command the spindle to operate.

 Note: There is a voltage output to the gearbox oil pump when the spindle operates.

Monitor the motor fan on the gearbox oil pump. If the motor fan on the gearbox oil pump does not operate, make sure the oil pump receives the correct voltage. Use a multimeter with needle-tip probes to measure the voltage across the cable connector for the gearbox oil pump.

 Note: Do not measure the voltage with the oil pump cable disconnected from the 300A cable.

The measured voltage must be 120 VAC. If the voltage is correct and the pump does not operate, go to Section 6.

If the voltage is not correct, make sure the voltage output from the I/O PCB is correct. Use a multimeter with needle tip test probes to measure the voltage between pin 1 and pin 2 on the 300A-cable connector at P41 (Classic Haas Control) or P32 (Next Generation Control) on the I/O PCB.

 Note: Do not measure the voltage with the 300A cable disconnected from the P41 connector on the I/O PCB.

The measured voltage must be 120 VAC. If the measured voltage is correct, the 300A cable is defective. If there is no voltage output, refer to these troubleshooting guides:

• CHC - I/O PCB - Troubleshooting Guide

A worn contactor can send unreliable power to the gearbox motor, which can cause a high load. Check the connections at the Wye/Delta contactor. Make sure the terminals are tight.

Corrective Action:

Refer to Wye-Delta Contactor - Troubleshooting Guide to troubleshoot the Wye/Delta connectors.

Corrective Action:

Shafted encoders (top) - Check the encoder pulley and belt for damage or wear.

“Hubbed” style encoders (bottom) - Use an indicator to check for run-out [1] or play [2] within the encoder and between the encoder [3] and motor shaft [4] (“Hubbed” style encoders mount directly to the gearbox or spindle motor). The runout is not to exceed 0.002".

Refer to the procedure applicable to your machine to set the spindle orientation after you have installed an encoder:

• CHC - Side-Mount Tool Changer - Set Parameter 257 - Spindle Orientation Offset
  
• CHC - Umbrella Tool Changer - Set Parameter 257 - Spindle Orientation Offset