27
TROUBLESHOOTING GUIDE
PROBLEM
PROBABLE CAUSE
REMEDY
The motor is running, but the
platform will not go up or
reach the floor of the vehicle.
1. Insufficient oil in power unit
tank.
2. Platform is over-loaded.
3. Pressure setting is low.
1. Fill tank to the appropriate level.
2. Load only to the rated capacity. Remove
some product if necessary.
3. Check and adjust the pressure to the proper
setting.
The platform will not go up or
reach floor level and the
motor does not run.
1. Low battery.
Check Maintenance Minder 2
®
for Low Voltage faults.
2. Tripped circuit breaker.
3. Power line is loose.
4. Bad motor, starter or switch
1. Recharge or replace battery.
2. Reset the circuit breaker.
3. Check the connections. If loose, tighten.
Check for corrosion and clean if necessary.
4. To test-push the UP switch, if motor does not
run, jump the two large terminals on the
starter solenoid. The motor should run, if not,
the motor is bad. If it does run, the solenoid is
bad or is not getting a signal from the switch
or the MM2. Use a test light to check.
Platform will not lower.
1. Low battery. Need 9.5 volts to
activate the DOWN valve coils.
2. Bad ground or poor electrical
connections.
3. Solenoid valve not opening.
4. Mechanical obstruction in gate.
1. Recharge or replace battery.
2. Check connections, if loose-tighten. Check
for corrosion and clean if necessary.
3. Drain valve
“C” valve (white wire) must
activate when DOWN switch is pushed. Use
test light to check.
4. Visually check.
Platform creeps down when
DOWN function is NOT
activated.
1.
Hydraulic leak.
2.
Defective piston seal in
cylinder.
3.
“C” valve (white wire), or check
valve not closing.
4.
Drain valve at base of optional
Hand Pump may be open.
5.
1. Visually check for leaks.
2. Replace seals or cylinder.
3. Clean and inspect.
4. Check to see if valve on Hand Pump is closed
tightly. Use end of Hand Pump handle.
Platform goes down slowly
when DOWN function is
activated.
1. Check for obstructions or
damage to arms.
2. Restricted or pinched hydraulic
lines.
3.
“C” valve (white wire) not fully
opening.
4. Incorrect hydraulic oil for cold
weather operation
1. Visually check.
2. Check for bent or pinched lines.
3. Clean and inspect.
4. Use recommended hydraulic oils for
conditions present.
Gate will not go OUT and/or
IN.
1. Check for obstructions or
binding in rails.
2. Low battery. Check
Maintenance Minder 2
®
for Low
Voltage faults. Need 10.5 volts
to activate the IN/OUT valve
coils
3. Tripped circuit breaker.
4. Power line is loose.
5. Bad motor, starter or switch.
1. Visually check. Check Side Button adjustment
2. Recharge or replace battery.
3. Reset the circuit breaker.
4. Check the connections. If loose, tighten.
Check for corrosion and clean if necessary.
5. To test: push OUT switch and motor does not
run, jump the two large terminals on the
starter solenoid. The motor should run, if it
does not run, you have a bad motor. If it does
run, the solenoid is bad or it is not getting a
signal from the switch. Use test light to check
(OUT
is “A” valve “red wire”, IN is “B” valve
“orange wire”).
