Fault Locating Procedure - PHE 751 Operation & Maintenance Manual

FAULT LOCATING PROCEDURE

Fault can be located by the following procedure.
1. Check for any mechanical damage to the tail lift, any mechanical damage of the vehicle that fouling the tail
lift operation, and nothing is impede the tail lift in its travel.
2. Check the battery voltage.
3. Check electrical supply to the power pack motor.
4. Check actual voltage of solenoid of motor. (Minimum voltage required is 9V for 12V systems while 18V is
required for 24V systems)
5. Check system pressure.
6. Check the operation of the tail lift with load and without load.
FAULT
Motor will not start
Motor runs too slowly
Motor runs but lift
does not rise, or does
not reach vehicle floor
Motor runs but lift
operate sluggishly and
does not reach vehicle
floor accompanied by
a loud noise
Lift rise slowly
PHE Tail Lift Operation & Maintenance Manual
IF THE CORRETIVE MEASURE DOES NOT SOLVE THE PROBLEM, PLEASE
CONSULT PHE TAIL LIFT MANUFACTURER (REFER PAGE 25) FOR TECHNICAL
SUPPORT.
POSSIBLE CAUSE
1. Battery dead
2. Push buttons lack negative contact
3. No negative contact at motor
4. Defective starter solenoid
1. Inadequate battery capacity
2. Brushes damaged by oil
1. Not enough oil in tank
2. Pin between motor and pump
sheared
3. No control current at solenoids
4. Burnt out control contacts
1. Relief valve open
2. Excessive loading
3. Started solenoid not functioning
properly
1. Not enough oil in tank
2. Voltage drop
3. Leaking pump
4. Relief valves setting too low
CORRECTIVE MEASURE
1. Charge or replace battery
2. Connect negative lead
3. Connect negative lead to unit
4. Check starter solenoid,
1. Charge or replace battery
2. Replace brushes, clean
1. Check oil level
2. Replace oil pump
3. Change fuse and/or control
4. Change control contacts
1. Adjust relief valve
2. Remove load
3. Check voltage at solenoid
1. Add oil & check for leaks
2. Check voltage/charging level
3. Replace pump
4. Adjust valve
46
TL-15-R04
replace if necessary
commutator
contacts
(see #4 above)
Check solenoid contacts,
replace solenoid if required