PROBLEM 19
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 60°F (16°C).
Yes
No
Yes No
Yes No
No
Yes
With pump in neutral, is system charge pressure
at more than 350 psi (24 bar) at Diagnostic screen?
Fill reservoir to correct level, warm hydraulic
oil to 60°F (16°C), or open shut-off valve.
Is there a hydraulic filter fault at Information screen?
Check and replace suction
filter if required.
Adjust charge pressure relief valve for 350 psi (24 bar). (See
Section 2 - Checking and Adjusting Charge Pressure).
350 psi (24 bar) Obtained
350 psi (24 bar) Not Obtained
Are system multifunction valves operating at the
recommended pressure?
Adjust or replace
faulty valve.
Check for internal leakage at pump and motor. (See Section 2 -Testing for
Pump or Motor Leakage.)
Normal High Leakage
Check control pressure at pump ports M4 and M5 and motor ports M7 and M8.
(See Section 2 - Location of Pump Ports and Motor 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.
System operating
properly.
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