Service Home TSC-1000 - Troubleshooting Guide - CHC - TG0141
Last updated: 10/15/2025

TSC-1000 - Troubleshooting Guide

TG0141

Revision B - 6/2025

Introduction

Download and fill out the coolant pump Inspection Report Checklist below before replacing any parts.

Coolant pump Inspection Report Checklist

This image shows the following components of the TSC system:

  1. TSC-1000 Pump
  2. Check Valve:
  3. Vacuum Generator:
  4. Precharge Solenoid (40-Taper belt-driven):
    or
    Coolant Union Solenoid (50-Taper or inline):

Output Pressure Reference Chart

This graph shows approximate pressure vs. tool orifice diameters.

Flow Rate Reference Chart

This graph shows approximate Flowrates vs. tool orifice diameters. This data can be used to aid in the selection of an appropriate spindle speeder for your application. 

Symptom Table

Symptom Possible Cause Corrective Action
Alarm 151 LOW THROUGH SPINDLE COOLANT There is an electrical fault with the TSC power supply. Inspect the contactors.
There is no incoming voltage. Check the incoming power.
The TSC pressure sensor does not work. Some coolant flow may occur if this is the case. Test and troubleshoot the coolant pressure sensor.

40T and 50T Belted Spindles

Pull studs will not enter into spindle taper

And possibly one of the following alarms:

Alarm 130 Tool Unclamped
Alarm 134 Tool Unclamp Fault

 There is noise being introduced through the IO and pre-charge solenoid. Order service kits 93-3451 & 93-3452 and follow the Low Load Solenoid Valve Kit - Installation procedure.
Excessive noise from pump Gear pump coupler misalignment. Order kit 93-4195 Coolant Gear Pump Coupler Conversion. Follow the Pump Head Coupling - Flexible Coupling Replacement procedure.
Carbide tips become damaged prematurely. The pressure regulator is set incorrectly. Test the TSC pressure then adjust the pressure regulator as needed. Refer to the TSC pressure test and the pressure regulator diagram below.

Low coolant flow, no alarm.

Low coolant flow, the pump cavitates (cavitation sounds like heavy grit in the pump head, or a suction sound) or is otherwise noisy

 The coolant does not return to the coolant tank fast enough. Remove chip buildup from the coolant return path.
The coolant level drops in the auxiliary filter tank while the machine is in operation. Check for leaks and inspect the gasket.
The auxiliary filter is dirty. Clean or Replace the auxiliary filter.
Air is trapped in the coolant pump. Cycle the pump power.
The vacuum generator, or air bleed valve, valve on the pump does not operate correctly. Clean the vacuum generator assembly, or air bleed valve.
Chips clog the supply hose. Remove all chips from the supply hose, the fittings, and the pipes.
The output hose touches the machine enclosure. Move the coolant output hose. Vibration from the hose can cause noise.
The pickup hose fittings are loose. Tighten the pickup hose fittings.
Gear pump coupler misalignment. Order kit 93-4195 Coolant Gear Pump Coupler Conversion. Follow the  Pump Head Coupling - Flexible Coupling Replacement procedure.

Electrical Fault

Check for a tripped circuit breaker [1] in the coolant pump.

Loose wires can cause arcing. Tighten and inspect the circuit breaker [1] and the contactor [2]. Make sure the screws that hold the wires of the circuit breaker [1] and contactor [2] are secure and tight.

Check the incoming voltage to the TSC unit. The TSC receives power from a separate source, independent from the machine's power. If there is no voltage, check for the tripped breaker at the external power supply. If the breaker is tripped, check for a short to ground at the external power supply connection.

Check the pump for shorts:

Measure the (3) leads to ground in the TSC power cable. If all leads test open to ground, the pump and cable do not have a short.

If the power cable lead test indicates a short, disconnect the cable from the motor. Measure the (3) cable leads on the pump contactor [2] to ground. If any lead on the pump contactor [2] tests short, the pump is at fault. If the pump contactor [2] leads do not test for short, the cable is at fault.

If all leads test OK:

Check the TSC motor for binding that could cause an over amperage condition.

Coolant Pump Operation

Vibrations or signs of rough operation are normal at high pressures.

Move the 1000-PSI coolant output hose away from the machine enclosure.

The oil level in the reservoir rises when the pump is hot and in operation. Check the oil level in the oil reservoir [1] when the pump is cold. Fill it to the cold fill line [2] with 5-30W synthetic oil.

TSC Pressure-Sensor Failure

Coolant Blockage

Remove all chips from the the auger trough [1], and the coolant return drain [2]. Complete these tasks:

Check for leaks in the intake hose from the coolant tank. Make sure that the tank lid gasket is not damaged, and that it is clean. Make sure that the latches are tight and locked. Do not over-tighten the latches. Use the wash down hose on the standard coolant pump to fill the auxiliary filter tank.

Make sure the pump pick-up tube is tightly connected to the tank lid. Cycle the power to the coolant pump to clear the empty chambers of air until the pump runs smoothly.

Drain the auxiliary filter tank. Remove the cover from the auxiliary filter cart.

Clean the auxiliary filter vacuum-generator assembly: Remove the components as shown in the illustration. Remove all of the chips that clog the supply hose in the coolant tank, the fittings, and the pipes.

Pumps without the vacuum generator have a prime line fitting [1] and an air bleed valve [2]. Clean prime line fitting [1] and the air bleed valve [2]. Make sure the prime line fitting [1] and the air bleed valve [2] are not clogged.

Tool Air Blast (TAB) Causes Coolant Tank Overflow

Through Spindle Coolant (TSC) flow diagram.

TSC Pressure Test

To test the TSC pressure order tool T-0152 [2].

Perform the following steps to use the TSC pressure tool:

  1. Grease around the o-ring [1] on the tool [2]. This will protect the o-ring from being damaged when inserted into the tool holder.
  2. Insert the tool into a tool holder. This is a 3/4 shank tool and will only work with a 3/4 set screw tool holder. Collet style tool holders will not work.
    Note: Use a single set screw type tool holder as a two set screw tool holder may effect the reading of the TSC pressure.
  3. Insert the tool in the spindle [4].
  4. Run the TSC to see the pressure reading.

Pressure Regulator Diagram

This image shows the following components of the pressure regulator system.

  1. Pressure Regulator Adjusting Bolt
  2. Regulator Jam Nut
  3. Filter Priming Hose
  4. Discharge Hose
  5. Intake Hose
  6. Bypass Hose

Electrical Diagram