Upright TM12 Service & Parts Manual

Page 4-3
Troubleshooting 4.2 - Cause and Remedy
TM12 Work Platform - European
Table 4-1:
Cause and Remedy
TROUBLE PROBABLE CAUSE REMEDY
All functions
inoperable, Electric
Motor does not start.
1. Open control circuit Circuit Breaker Check control circuit Circuit Breaker. Reset if open.
2. Blown Electric Motor Fuse Check 175 amp Electric Motor Fuse. Replace if blown.
3. Faulty Battery Charger
Check the voltage output of the Battery Charger. If less than 24
VDC, repair and replace.
4. Faulty Battery (ies)
After completely charging Batteries, test each Battery. Replace as
required.
5. Faulty Electric Motor
While operating the steering function, check voltage across the
Electric Motor terminals. If 24 VDC is present, replace the Motor.
6. Faulty Motor Relay
While operating the steering, check voltage across the coil
terminals of Motor Relay. If no voltage is present, proceed with
step 7. If 20 VDC or more, check continuity across the contact
terminals of Motor Relay while still operating the steering
function. If there is no continuity, replace the defective Motor
Relay.
7. Emergency Stop Switch failed open
With the Emergency Stop Switch in the ON position, check
continuity across the contacts. If none, replace.
All functions
inoperable. Electric
Motor starts when
control is actuated.
1. Hydraulic Reservoir low Check hydraulic fluid level, top off as required.
2. Faulty Hydraulic Pump
Check pressure and delivery of the Hydraulic Pump. Replace if
required.
3. Faulty Controller Check operation. Replace switch if required.
4. Proportional Valve Check operation. Replace if required.
Electric Motor
continues to run after
controls are returned
to the OFF position.
Motor relay contacts fused together
Check operation, replace if required. With 0 voltage at the coil
terminals of the Motor Relay (CR1) check continuity across the
contact terminals. If there is continuity, replace the Motor Relay.
Steering inoperable
or functions
sluggishly.
1. Faulty Steering Switch Test Steering Switch for continuity. Replace if defective.
2. Mechanical damage Inspect all steering components. Replace damaged parts.
3. Steering Valve stuck Inspect Steering Valve. If spool is sticking, replace.
4. Steering Cylinder piston seal leaking
Check Steering Cylinder for leakage from one port to another.
Repair as required.
5. Steering Relief Adjust the relief valve, if not adjustable replace.
Work Platform will
not steer right.
1. Faulty Steering Switch Test Controller Switch for continuity. Replace if defective.
2. Faulty Diode Test Diode. Replace if defective.
3. Faulty Steer Right Solenoid
Test Steer Right Solenoid. If the proper voltage is present and the
coil is not magnetized, replace.
Work Platform will
not steer left.
1. Faulty Steer Switch Test Steering Switch for continuity. Replace if defective.
2. Faulty Diode Test Diode. Replace if defective.
3. Faulty Steer Left Solenoid
Test Steer Left Solenoid. If the proper voltage is present and the
coil is not magnetized, replace.
Work Platform will
not drive forward or
reverse. Lift function
operable.
1. Faulty Drive/Lift Selector Switch Check continuity of Drive/Lift Switch. Replace if defective.
2. Faulty Drive/Lift Valve
Check the Drive/Lift Valve. If the spool is not shifting, replace the
valve.
3. Mechanical failure Inspect Drive Motor shafts, hubs, and keys.
4. Worn Drive Motors
Check hydraulic pressure being delivered to the Drive Motors. If
sufficient, replace Drive Motors.
No high speed drive. 1. Faulty Relay Test Relay (CR4). Replace if faulty.
2. Faulty Down Limit Switch Check Switch for continuity. Replace if faulty.
3. Faulty Proportional Coil/Valve Test coil and valve. Replace if defective.
No drive forward but
drives in reverse. Lift
function operable.
1. Faulty Drive/Lift Selector Switch Test Drive/Lift Switch for continuity. Replace if faulty.
2. Faulty Counterbalance Valves
Check pressure of Counterbalance Valves. Replace or resetvalves
as required.
No drive forward but
drives in reverse. No
lift function.
1. Faulty Drive/Lift Selector Switch Test Drive/Lift Switch for continuity. Replace if faulty.
2. Faulty Controller Check operation of controller switch. Replace if required.
3. Faulty Up/Fwd Relay Test Relay. Replace if faulty.

Upright TM12 Specifications

General

Brand	Upright
Model	TM12
Category	Lifting Systems
Language	English