Hydraulic Power Unit - Pressure Gauge - Replacement

Applies to machines built from: 
July, 2004
AD0281 Rev B

Hydraulic Power Unit - Pressure Gauge - Replacement - Introduction

This procedure tells you how to replace the chuck or tailstock pressure gauge on the hydraulic power unit (HPU).
Safety Notes
Caution: When you do maintenance or repair on CNC machines and their components, you must always follow basic safety precautions. This decreases the risk of injury and mechanical damage.

Do these steps before you do work in the machine or in the control cabinet:
  • Set the main circuit breaker to the OFF position.
  • Use an approved lock with an approved safety tag. Always follow lock-out procedures in accordance to local government rules.
  • After turning off the machine, wait at least 5 minutes before working in the control cabinet, to allow power to dissipate. Wait for the voltage indicator LED on the vector drive to go off completely.
  • Always turn off the main air supply when you work on any part of the pneumatic system.
  • Make sure to rest the spindle head on a block of wood when work is done on a vertical axis. This will prevent any unintended movement that could result in the axis falling.
  • Never alter any safety circuits on the machine.
You should not do machine repair or service procedures unless you are qualified and knowledgeable about the processes. Serious damage to the machine components can result in costly repairs. The service technicians at your Haas Factory Outlet (HFO) have the training and experience, and are certified to do these tasks safely and correctly. The repair and service work performed by your HFO is protected with a limited warranty.
danger: Some service procedures can be dangerous or life-threatening. DO NOT attempt a procedure that you do not fully understand. If you have any doubts about doing a procedure contact your Haas Factory Outlet (HFO) and schedule a service visit.

Machine Compatibility

Do this procedure for these machines: ST-10/15/20/25/30/35/40

Parts Included

KIT PN: 93-1336, Pressure Gauge Kit with Snubber. QTY: 1
58-0741
QTY: 1
GAUGE, HYDRAULIC, 0-600 PSI 1/4-M NPT

HPU - Pressure Gauge - Replacement

Step 1

Push POWER OFF.

Set the main circuit breaker to the OFF position. Lock the main circuit breaker. Use an approved lock with an approved safety tag.

Step 2

Use an open-end wrench to support the fixed portion [1] of the gauge adapter fitting.

Use another open-end wrench to turn the swivel portion [2] of the fitting.

Remove the gauge.

Step 3

Do these steps to make the gauge assembly:

  • Connect the SNUBBER [B] to the GAUGE [A].
  • Connect the swivel adapter [1] to the snubber/gauge assembly.

Connect the completed gauge assembly to the hydraulic power unit. Tighten the fitting [4] with your hand.

Put a wrench on the large end [3] of the fitting. This keeps the gauge in position.

Put another wrench on the small end [4] of the fitting. Turn it clockwise 1/8 to 1/4 turn.

Operate the hydraulic power unit. Examine the gauge assembly for leaks.

Be aware: Many service and repair procedures should be done only by authorized personnel. The service technicians at your Haas Factory Outlet (HFO) have the training, experience, and are certified to do these tasks safely and correctly. You should not do machine repair or service procedures unless you are qualified and knowledgeable about the processes.

Danger: Some service procedures can be dangerous or life-threatening. DO NOT attempt a procedure that you do not completely understand. Contact your Haas Factory Outlet (HFO) and schedule a service technician visit if you have any doubts about doing a procedure.

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