Section E - Hydraulics
Fault Finding
Levelling Circuit
E - 46 E - 46
9803-9450-2
Levelling Circuit
Fig 35.
Symptoms Possible Causes Countermeasures
Boom delay at start of self-level
or unstable self-level
Air in system Cycle boom and bucket slowly to rid
system of air
Loaded bucket dumps or
raises when control valve is in
neutral
Unloading spool is leaking Remove and inspect unloading spool for
damage
Insufficient self-level Pin X is out of adjustment Re-adjust pin to achieve proper flow split
Broken unloading spool spring Replace unloading spool spring
Flow divider spool stuck towards port B Remove flow divider spool and check for
damage
Bucket dumps faster than
boom raises. Too much self-
level
Pin X out of adjustment Re-adjust pin to achieve proper flow split
Flow divider spool stuck towards port B Remove flow divider spool and check for
damage
Flow divider spool installed incorrectly Remove spool and install with internal
orifice towards port B
With bucket dumped, boom is
slow in starting to raise
Dampening orifice in the unloading spool is
blocked
Remove unloading spool and clean
dampening orifice
Bucket does not move in self-
level
Pin X is screwed in all the way Re-adjust pin to achieve proper flow split
Dampening orifice in the unloading spool is
blocked
Remove unloading spool and clean
dampening orifice
Ports A and B cross connected Reverse hoses to ports A and B
Bucket raises in self-level Ports A and B cross connected Reverse hoses to ports A and B
External leakage Damaged ‘O’ ring Replace ‘O’ ring
X
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