24 bar (350 psi) Not Obtained
CHECKS
Is hydraulic oil level in reservoir OK?
PROBLEM 21
Hydraulic system is operating hot.
POSSIBLE CAUSES
Low hydraulic oil level in reservoir. Heat exchanger problem. Dirty filter.
System multifunction valves are not set correctly. Pump or motor problem.
Yes
No
Fill tank to full level or open shut-off valve.
Is heat exchanger radiator clean?
Yes No
Clean, repair, or replace heat exchanger radiator.
Yes
No
Are fans turning?
Adjust, repair, or replace fan motor, fan relief valve, or pump.
Yes No
Is system charge pressure 24 bar (350 psi) at pressure sensor station?
Yes
No
Are system multifunction valves
operating at recommended system
pressures?
Are suction filters clean?
Replace filters.
Yes No
Adjust or replace problem valve.
(See Test 17—Setting the Pump
Pressure.)
Adjust charge pressure relief valve for 24 bar (350 psi).
(See Test 18—Adjusting the Pump Charge Pressure Relief
.)
24 bar (350 psi) Obtained
System should be at correct temperature.
Check for internal leakage at pump and motor. (See Te st 7 —
Testing for Pump and Motor Leakage.)
Normal
High Leakage
Is system operating pressure excessive?
Yes
No
Repair or replace pump or motor, as required.
Repair or replace pump or motor, as required.
Locate and reduce load on
motor transmission.
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