Warning
Unintended movement of the machine or mechanism may cause injury to the technician or bystanders.
To protect against unintended movement, secure the machine or disable/disconnect the mechanism
while servicing.
Prior to installing the pump, inspect for damage incurred during shipping. Make certain all system
components (reservoir, hoses, valves, fittings, heat exchanger, etc.) are clean prior to filling with fluid.
Start-up procedure
1. Connect the pump to the prime mover. Ensure that pump shaft is properly aligned with the shaft of
the prime mover.
Caution
Incorrect shaft alignment may result in damage to drive shaft, bearings, or seal which can cause
external oil leakage.
2. Fill the reservoir with recommended hydraulic fluid. Always filter fluid through a 10 micron absolute
filter pouring into the reservoir. Never reuse hydraulic fluid.
3. Fill the main pump housing with clean hydraulic fluid. Pour filtered oil directly into the upper most
case drain port.
4. Fill the inlet line leading from the pump to the reservoir. Check the inlet line for properly tightened
fittings and be certain it is free of restrictions and air leaks.
5. To ensure the pump stays filled with oil, install the case drain line in the upper most case drain port.
6. Install a gauge at port M2 to monitor system pressure during start up.
Follow recommendations in the vehicle/machine operator’s manual for prime mover start up
procedures.
7. While watching the pressure gauge at M2, jog the prime mover or run at the lowest possible speed
until system pressure builds to normal levels (minimum 11 bar [160 psi]). Once system pressure is
established, increase to full operating speed. If the pump does not maintain system pressure, shut
down the prime mover, determine cause, and take corrective action. Refer to Troubleshooting.
8. Operate the hydraulic system for at least fifteen minutes under light load conditions.
9. Check and adjust control settings as necessary after installation. Refer to Adjustments.
10. Shut down the prime mover and remove the pressure gauge. Replace plug at port M2.
11. Check the fluid level in the reservoir; add clean filtered fluid if necessary.
The pump is now ready for operation.
Service Manual
Series 42 Axial Piston Closed Circuit Pumps
Initial Start-Up Procedure
520L0638 • Rev 0300 • July 2015 25
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