NorthStar 4065 - Troubleshooting

12
Troubleshooting
PROBLEM
Cylinder rod will not move
SOLUTION: A,C,E,O,Q,R,U,V
Slow cylinder shaft speed when extending or
retracting
SOLUTION: E,J,L,O,R,S,T,W
Trencher 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
E - Gear sections damaged
Items D through H require repair of the pump by an authorized service
F - Frozen or seized pump
center
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 valve 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 valve for authorized repair
U - Damaged control valve
Return directional valve for authorized repair
V - Blocked control valve
Flush and clean the hydraulic system
W - Internally damaged cylinder
Return cylinder for authorized repair