TROUBLESHOOTING
Problem
Cylinder rod will not move
Solution: A, C, E, O, Q, R, U, V
Slow cylinder shaft speed when extend-
ing or retracting
Solution: E, J, L, O, R, S, T, W
Backhoe will not dig or digs extremely
slowly
Solution: D, H, J, M, R, S, T, W
Engine stalls during digging motion
Solution: K, N, P
Engine will not turn or stalls under low
load conditions
Solution: B, F, K, Q, V
Leaking pump shaft seal
Solution: A, B, E, G, I
Cause
Solution
A – Broken driveshaft on pump
Return pump for authorized repair
B – Engine/pump misalignment
Correct the engine/pump alignment
C – Loose shaft coupling
Correct the engine/pump alignment
D – Small gear section damaged
Points D through H require repair of the pump
by an authorized service center
E – Gear sections damaged
F – Frozen or seized pump
G – Poorly positioned shaft seal
H – Pump check valve leaking
I – Plugged oil breather
Make sure the reservoir is properly vented
J – Excessive pump inlet vacuum
Clean inlet hoses and free them of any leaks
K – Low horsepower/weak engine
Have engine serviced at an authorized service
center
L – Slow engine speed
Have engine serviced at an authorized service
center
M – Low relief valve setting
Adjust while using a pressure gauge and with
assistance of a professional
N – High relief valve setting
Adjust while using a pressure gauge and with
assistance of a professional
O – Damaged relief valve
Return directional value for authorized repair
P – High unloading valve setting
Adjust while using a pressure gauge and with
assistance of a professional
Q – Hydraulic lines blocked
Flush and clean the hydraulic system
R – Too little oil to the pump
Add oil to the reservoir
S – Air in the hydraulic oil
Clean reservoir and add oil
T – Control valve leaking internally
Return directional value for authorized repair
U – Damaged control valve
Return directional value for authorized repair
V – Blocked control valve
Flush and clean the hydraulic system
W – Internally damaged cylinder
Return cylinder for authorized repair
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