PROBLEM 20
Closed-loop hydraulic system response is sluggish.
POSSIBLE CAUSES
Low hydraulic oil level in reservoir. Low hydraulic oil temperature. Reservoir shut-off is partially closed.
Dirty charge filter. System multifunction valves are not set correctly. Pump or motor problem.
CHECKS
Hydraulic oil level in reservoir, reservoir shut-off valve is fully open,
and hydraulic oil above 15
°C (60°F).
Yes
No
Yes
No
Yes
No
No
Yes
With pump in neutral, is system charge pressure
at more than 24 bar (350 psi) at diagnostic display
screen?
Fill reservoir to correct level, warm hydraulic
oil to 15
°C (60°F), and open shut-off valve.
Does tank filter read less than 0.5 bar (7 psi) on diagnostic display screen?
Check and replace suction
filter if required.
Adjust charge pressure relief valve for 24 bar (350 psi). (See Test
18—Adjusting the Pump Charge Pressure Relief.)
24 bar (350 psi) Obtained
24 bar (350 psi) Not Obtained
System multifunction valves operating at recommended system pressure.
Adjust or replace faulty valve.
Check for internal leakage at pump and motor. (See Te st 7 —
Testing for Pump and Motor Leakage.)
Normal
High Leakage
Check control pressure at pump ports M4 and M5 and motor
ports M7 and M8. (See Test 8—Location of Pump Ports
.)
Pressure OK
Pressure Not OK
Consult dealer/factory.
Repair or replace pump EDC
or motor PCP, as required.
Repair or replace pump
or motor as required.
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