Preventive Maintenance Checks and Services (PMCS) - Continued.
ITEM TO BE
Check Hydraulic Pressure Relief Valves.
Setting hydraulic pressure is an extremely intricate
operation and should be performed only after satisfying
the following conditions:
a. Warm hydraulic oil to operating temperature.
b. Be sure to operate at full governed engine speed
as relief valve setting will vary with flow rate.
c. Use a good quality 4,000 psi (27,580 kPa) gage
equipped with a short pressure hose and 1/4 inch female
quick disconnect. Be certain to calibrate pressure gage
used. Gage calibration can be lost if gage is subjected
to rapidly pulsating pressure for a few seconds. Gage
must have a proper snubber to read center of pump
pressure ripple or erroneous readings will result.