POLYURETHANE
MACHINERY
CORPORATION
PH-2 SERVICE MANUAL
12. TROUBLESHOOTING
• Problem: Hydraulic Pump does not develop pressure.
Solutions:
NOTE! Hydraulic pressure is not generated if the Motor Power
Switch (See Figure 6 on page 15) is OFF or the Pump Switch (See
Figure 6 on page 15) is in the OFF position.
Hydraulic Power Package - With the Pump Switch in the NORMAL position, the
failure of the Hydraulic Pump to develop pressure is loss of pump suction (prime). To
ensure positive prime, check the following:
a. Motor Rotation.
b. Hydraulic Reservoir is filled to the correct level.
c. Hydraulic Pump Case is filled with the proper hydraulic fluid.
d. Loose Inlet Plumbing: Check that all inlet plumbing to Hydraulic Pump is tight
ensuring no air leakage into the hydraulic system.
• Problem: Low or zero hydraulic pressure with unusual Hydraulic Pump noises.
Solutions:
1. The use of an incorrect hydraulic fluid can result is unusual noises from the pump,
excessive wear, and moisture absorption. Ensure the hydraulic oil used is from
the list on page 53. In addition, continuous excessive hydraulic oil temperature
as well as failure to change the hydraulic oil on a yearly basis will cause the oil to
fail and result in excessive Hydraulic Pump wear and unusual noises.
2. Loose Inlet Plumbing: Check that all inlet plumbing to Hydraulic Pump is tight,
ensuring no air leakage into the hydraulic system.
REVISION 1.2 37
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