PROBLEM 19
The 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 16°C (60°F)
Yes
No
Yes No
Yes No
No
Yes
With the pump in neutral, is the system charge pressure
at more than 24 bar (348 psi) on the Diagnostic screen?
Fill the reservoir to the correct level, warm hydraulic
oil to 16°C (60°F), or open the shut-off valve.
Is there a hydraulic filter fault at the Information screen?
Check and replace the
suction filter if required.
Adjust the charge pressure relief valve for 24 bar (348 psi). (See
Section 2 - Checking and Adjusting Charge Pressure).
24 bar (348 psi) Obtained
24 bar (348 psi) Not Obtained
Are the system multifunction valves operating at
the recommended pressure?
Adjust or replace
the faulty valve.
Check for internal leakage at the pump and motor. (See Section 2 -Testing
for Pump or Motor Leakage.)
Normal High Leakage
Check the 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
Repair or replace pump EDC
or motor PCP, as required.
Repair or replace the pump
or motor as required.
System is operating
properly.
Consult your Manitowoc dealer or the
Crane Care Lattice Team.
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