Section E - Hydraulics
Fault Finding
Loader Circuit
E - 43 E - 43
9803-9450-2
Loader Circuit
The purpose of this section is to help you trace hydraulic
problems to a faulty unit (valve, actuator, ram etc.). Once
you have traced the faulty unit, refer to the appropriate
dismantling, inspecting and test instructions given
elsewhere in the manual.
To help identify circuits, valves, rams etc. mentioned in the
problem solving procedures, refer to hydraulic schematic
diagrams.
– Before you begin problem solving, read the Safety
Information at the beginning of this manual.
– Make simple checks before say, stripping a major
component.
– Make sure that the hydraulic fluid is at correct working
temperature (50 °C, 122 °F).
– Whatever the fault, check the condition of the
hydraulic fluid. Drain and replace if necessary.
– Be sure to remove ALL contamination and if possible
identify its origin. It may be part of a component from
elsewhere in the circuit.
PROBLEM CAUSE
Lack of power in all loader functions. 1, 2, 3, 4, 6, 7,18, 20
All hydraulic rams slow to operate. 3, 4, 7, 8, 10, 11, 13
One hydraulic service fails to operate or is slow to operate. 13, 14, 15, 16, 17, 19
Engine tends to stall when hydraulics are under load. 3, 19, 20
Valve spool sticking. 21, 23, 24, 25, 26, 27, 28, 29
Ram creep. 15, 18
Hydraulic oil becomes too hot. 5, 6, 12, 22
Boom judders when used while machine is moving. 9, 11, 13
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