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GROVE
Published 1-20-2017, Control# 483-02
4-3
CD5515-2/YB5515-2 SERVICE MANUAL
HYDRAULIC SYSTEM
4
Second, make an analysis of symptoms. The function of
each component in the system must be known before a
correct analysis can be made.
Remember:
•
If a problem is common to all circuits, the component
which is causing the problem must also be common to
all circuits. Examples are: the engine, pump, hydraulic
tank and filters.
•
If the problem is common to only two or three circuits,
the component which is causing the problem must be
common to those two or three circuits. Examples are:
pump section, relief valve, hydraulic swivel, etc.
•
If a problem is in only one circuit, then the component
which is causing the problem must be in that circuit.
Examples are: valve section, cylinder, motor.
Again, use the schematic. Find which components are in the
circuit or circuits. What component can cause the problem
with these symptoms? Make a list of the possible causes.
Start at the source of the flow in that circuit. If the problem is
in all circuits, start at the pump. Know the direction of oil flow
through each circuit.
Use the flowmeter and pressure gauge to check your
diagnosis of the problem. Start at the source of the flow and
check each component in sequence until the exact location
of the problem is found.
If the problem is in two or three circuits, check each circuit
separately. After a circuit is checked, use caps or plugs to
remove that circuit from the system. Continue to next circuit
down the line until the problem is found.
NOTE:
Do not remove the main relief valve from the circuit.
The relief valve must be kept in the circuit to
p r e v e n t d a m a g e t o t h e p u m p a n d o t h e r
components.
TROUBLESHOOTING GUIDES
Table 4-1
General Hydraulic System Troubleshooting
Problem
Possible Cause
Remedy
Noise (above normal).
Air in system.
With engine at low rpm, operate
all control functions several times
to return the air to atmosphere
through the tank breather.
Low oil supply.
Add recommended oil.
Restriction in pump inlet line.
Remove and clean inlet line to
pump.
Dirty oil.
Change oil and filters.
Loose clamps, vibration of hydraulic
lines.
Check and tighten.
Dirt or foreign material in a relief valve.
Clean or replace the relief valve.
Broken control valve spool.
Replace the control valve section.
Pump bearings worn.
Replace the bearings or pump.
Reference Only
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