JLG X14JH Operator Manual - Manual (Page 87)

5. TROUBLESHOOTING
BOOM LIFT MODELS X14JH
JLG
84 X14JHR0220311
PROBLEM CAUSE SOLUTION
The pump is very noisy • The pump does not suck
• Worn pump
• The pump sucks air • Replace pump
• Check oil level in the relative
tank
With the pump activated, the
oil does not reach the hydrau‑
lic system or arrives at a pres‑
sure too low to move the
machine • See point 1
• Maximum pressure valves
not calibrated or dirty
• Worn maximum pressure
valves
• The solenoid protection
fuses of the solenoid power
valves are burnt‑out
• The hydraulic switch situa‑
ted under the column is faulty • See point 1
• Calibrate again or clean the
maximum pressure valves
• Replace maximum pressure
valves
• Replace the control solenoid
of the emergency solenoid val‑
ves
• Clean or replace the emer‑
gency solenoid valves
• Replace solenoid fuses
Once the equipment is stabi‑
lised, you cannot detach the
overhead part from the sup‑
ports at rest • See point 2
• The solenoid of the emer‑
gency solenoid valves does not
get excited (only movement of
the overhead part)
• The stabiliser microswitches
do not close the contact • See point 2
• Regulate the microswitches
on the stabilisers
The machine superstructure
does not hold the working
platform with the rated load
on board • Locking valves dirty or
faulty • Dismantle and clean the
locking valves on the jacks
that hold the load
When working with the
overhead part, the machine
stops • Accidental pressing of the
emergency pushbutton
• The general protection fuse
of the electric system is burnt‑
out
• The load cell has been acti‑
vated • Put back the pressed push‑
button to neutral position
• Replace the general protec‑
tion fuse
• Unload the machine