1020

Access TSC Filter Housing

Power down machine and relieve TSC system pressure. Locate the inline filter housing typically mounted near the TSC pump assembly.

Always relieve system pressure before opening TSC components - high pressure coolant can cause injury

Remove and Inspect Filter Element

Unscrew filter housing and remove the filter cartridge. Inspect for metal chips, coolant residue, or other debris blocking flow passages.

Take a photo of the debris pattern - it can indicate upstream wear issues

Clean or Replace Filter

If lightly contaminated, clean with compressed air and coolant. If heavily clogged or damaged, install new OEM filter element per Haas specifications.

Always use genuine Haas filter elements - aftermarket filters may have incorrect micron ratings

Test System Operation

Reassemble housing, power up machine, and activate TSC via M88 command. Monitor pressure gauge readings and verify alarm clears.

Check parameter 378 (TSC Pressure) to verify system is achieving proper operating pressure

Check TSC Pump Operation

Navigate to CURRENT COMMANDS and activate TSC with M88. Listen for pump motor operation and check for unusual noises or vibration.

A healthy TSC pump should reach full pressure within 3-5 seconds of M88 activation

Verify Pump Pressure Output

Check the TSC pressure gauge reading during operation. Normal operating pressure should be 300-1000 PSI depending on machine configuration.

Do not attempt to disassemble pump while under pressure

Inspect Pump Connections

Check all fittings, hoses, and connections at the pump for leaks or loose connections that could cause pressure loss.

Use soapy water to detect small leaks that may not be visible

Test Differential Pressure Switch

With system pressurized, verify the differential pressure switch is functioning correctly by checking continuity across switch contacts.

Switch should be closed (continuity) when pressure differential is within normal range

Check TSC Coolant Level

Verify coolant level in the TSC reservoir tank. Level should be above minimum mark to prevent pump cavitation and air ingestion.

Never run TSC pump with low coolant level - this will damage pump seals

Inspect Suction Line

Check the pump suction line from reservoir to pump for cracks, loose fittings, or damaged hose that could allow air ingestion.

Air bubbles in the sight glass indicate suction line air leaks

Prime TSC System

If air is present in system, manually prime by filling reservoir and cycling pump with M88/M89 commands to purge air from lines.

It may take several prime cycles to completely purge air from the system

Verify Coolant Quality

Check coolant concentration and condition. Contaminated or improper coolant mixture can cause pump performance issues.

TSC systems typically require higher quality coolant than flood systems

Locate Pressure Switch

Find the differential pressure switch in the TSC system, typically mounted on or near the filter housing with electrical connections to the control.

Switch usually has two pressure ports - inlet and outlet - plus electrical connector

Test Switch Continuity

With system depressurized, use multimeter to check switch continuity. Switch should change state when pressure differential changes.

Disconnect electrical connector before testing to avoid damage to control

Verify Switch Calibration

Compare actual pressure readings with switch activation point. Switch should activate at manufacturer specified differential pressure.

Consult Haas electrical schematics for correct switch part number and specifications

Replace Defective Switch

If switch tests faulty, replace with genuine Haas part. Ensure proper torque on pressure fittings and secure electrical connections.

Apply thread sealant to pressure fittings but avoid getting sealant in pressure ports