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This procedure tells you how to replace a 300/1k psi pump head or motor in each of these systems:

• High-Pressure Coolant (HPC) - Lathe
• Through-Spindle Coolant (TSC) - Mill

This illustration shows each coolant pump type that is in this procedure:

• Lid-mounted HPC, TSC pump assembly [1]
• HPC, TSC pump with stand assembly [2]
• HPC, TSC Auto-Clean pump with stand assembly [3]

Before proceeding check the pump head casting and verify if the casting has "REV" or "REV C" report what you have found to a service tech. Verify the replacement pump head has "REV C" on the casting if it does not contact Haas support.

Disconnect the power cable for the motor. Remove the pump assembly from the coolant tank to let the coolant drain.

If you must replace the motor and the cable, or if the new cable is not compatible with the machine:

Remove the cable [1] from the old motor.

Remove the (2) screws [3] and cover [2] from the new HPC, TSC MOTOR [B].

Remove the cable from the new HPC, TSC MOTOR [B].

Install the cable [1] from the old motor to the new HPC, TSC MOTOR [B].

Connect the old cable to the motor. Use the (3) CRIMP WIRE NUTS [C]. Use crimp pliers and wire strippers to correctly connect the cable.

To replace a pump head or motor that is lid-mounted:

Remove these parts:

• (4) socket head cap screws [2] and the motor [1]
• If you only need to replace the motor [1], replace it now. If no other parts need to be replaced, the procedure is complete.
• coupler [3] and (4) socket head cap screws [4]
• (2) compression fittings [5] and pump head assembly [6]
• (2) steel tube assemblies [7]

Install the new HPC, TSC PUMP HEAD [A] and the new HPC, TSC MOTOR [B] in the opposite sequence that they were removed.

Leave the motor mounting bolts [2] hand tight. Operate the pump for few seconds to allow the motor to float in. Turn off the pump and torque the motor mounting bolts gradually in criss-cross pattern.

Refer to the "Pump Head Coupling Variations" section at the end of the document for procedure details on your particular pump/coupling/motor combination.

To replace a pump head or motor that has a stand:

Remove these parts:

• (4) socket head cap screws [2] and the motor [1]
• If you only need to replace the motor [1], replace it now. If no other parts need to be replaced, the procedure is complete.
• (4) button head cap screws [8] and the filter housing [9]
• coupler [3] and (4) socket head cap screws [4]
• (2) compression fittings [5] and pump head assembly [6]
• (2) steel tube assemblies [7]

Install the new HPC, TSC PUMP HEAD [A] and the new HPC, TSC MOTOR [B] in the opposite sequence that they were removed.

Leave the motor mounting bolts [2] hand tight. Operate the pump for few seconds to allow the motor to float in. Turn off the pump and torque the motor mounting bolts gradually in criss-cross pattern.

Refer to the "Pump Head Coupling Variations" section at the end of the document for procedure details on your particular pump/coupling/motor combination.

To replace a pump head or motor on a system that has the auto-clean filter:

Remove these parts:

• (2) button head cap screws [2] and (2) pump stand covers [1]
• air cylinder [5] (Turn counterclockwise to remove.)
• intake tube assembly [7], vacuum switch assembly [8], and brass fitting [9]
• steel fitting [10], (4) button head cap screws [11], and intake filter assembly [12]
• (4) socket head cap screws [4], coupler [3], and pump head assembly [6]

Refer to the "Pump Head Coupling Variations" section at the end of the document for procedure details on your particular pump/coupling/motor combination.

Remove these parts:

• (2) 90 degree tubes [3]
• If you only need to replace the pump head, replace it now. If no other parts need to be replaced, install the parts in the opposite sequence that they were removed. The procedure is complete.
• (4) socket head cap screws [2]
• motor [1]

Install the new HPC, TSC MOTOR [B] in the opposite sequence that it was removed.

Leave the motor mounting bolts [2] hand tight. Operate the pump for few seconds to allow the motor to float in. Turn off the pump and torque the motor mounting bolts gradually in criss-cross pattern.

Refer to previous step to assemble the auto-clean filter.

Install the coolant pump assembly. Test for leaks and correct pressure.

When the pump head is removed from the pump assembly, examine it to see which style coupling it has:

A)      Coupling pressed onto the pump head shaft

B)      Slip fit coupling with spline on pump head side and key on motor side

C)       Coupling sweat-fit onto motor shaft

D)       Set screw spline coupling

Coupling Pressed Onto the Pump Head Shaft

• Discard the old spacers, screws, washers, and mounting plate. These will all be replaced with parts from kit 93-2914. Use the new screws, washers, spacers, and mount plate to install the replacement pump head into the assembly. 
• Remove the motor from the pump assembly and clean the shaft with a rag. Use scotchbrite and/or lightly stone to remove any burrs or dings on the shaft. 
• Heat must be applied to replacement coupling from kit 93-2914 [1] to fit on the motor shaft [2]. Due to the possibility of variation in motor shaft sizes, it is necessary to get the coupler extremely hot to avoid it sticking on the motor shaft before it is fully seated.
• Using a timer, set the non-splined end of the coupling on a hot plate set to 1000F for 30 minutes.
• Do not use a motor spacer when installing the coupling. The motor shaft will bottom out inside the coupling when it is fully seated. 
• Apply red grease onto the pump head splines and reassemble the pump assembly.
  

Slip Fit Coupling with Spline on Pump End and Key on Motor End

• Discard the old slip-fit coupling and motor shaft key. Remove the motor from the pump assembly and clean the shaft with a rag. Use scotchbrite and/or lightly stone to remove any burrs or dings on the shaft. 
• Heat must be applied to replacement coupling from kit 93-2914 [1] to fit on the motor shaft [2]. Due to the possibility of variation in motor shaft sizes, it is necessary to get the coupler extemely hot to avoid it sticking on the motor shaft before it is fully seated.
• Using a timer, set the non-splined end of the coupling on a hot plate set to 1000F for 30 minutes.
• Do not use a motor spacer when installing the coupling. The motor shaft will bottom out inside the coupling when it is fully seated. 
• Apply red grease onto the pump head splines and reassemble the pump assembly using the replacement pump head and original hardware.
  

Coupling Sweat-Fit onto the Motor Shaft

• Replace the old pump head with the new pump head [1], re-using all original hardware. Re-use coupling.
• Apply red grease to the pump head shaft spline teeth before assembly.
  

Set Screw Spline Coupling

• Discard the old spacers, screws, washers, and mounting plate. These will all be replaced with parts from kit 93-2914A. Use the new screws, washers, spacers, and mount plate to install the replacement pump head into the assembly. 
• Use the coupling [1] from the 93-2914A kit, slide it onto the shaft with the threaded holes lined up to the key way [2] on the shaft.
• Thread the set screws (44-0078)[3] in until they sit on the bottom face of the key way.
• Apply red grease to the pump head shaft splines and reassemble the pump assembly.