THIEMAN TopLifter TT-15, Руководство пользователя

Страница: 29 / 32

29 .
TROUBLESHOOTING GUIDE
TT15ET
Test Equipment: 1. 0-5000 psi pressure gauge
2. DC voltmeter/ohm meter
3. DC amp meter
4. standard mechanics tools
Note: Please refer to the electrical diagrams and hose connection drawings in the liftgate’s owner’s manual when
troubleshooting. This guide is only for standard Thieman liftgates. Special liftgates with options other than those in the
owner's manual will require special diagrams for troubleshooting. Read and understand this entire guide completely before
doing any troubleshooting. Certain listed problems may be related to other problems listed so a comprehensive knowledge
is required before proceeding.
1. Problem - Pump motor will not run in the raise mode
Cause Correction
a. Tripped circuit breaker Reset the circuit breaker located within 2ft of the liftgate supply battery(ies).
b. Blown 20A fuse Replace 20A fuse (s). Each control cord should have a 20A in-line fuse on the black
wire, where it connects to the 2ga. battery cable at the motor start solenoid.
c. Improper battery cable
connection or improper
ground connection
The “at rest” voltage for the batteries without the engine running and under no load
should be at least 12.5V, and this voltage should be seen on the heavy 2ga. battery
cable, where it connects to the large terminal of the motor start solenoid. The
minimum voltage between the motor stud and ground is 10V at maximum
conditions, with pump motor, batteries, and cables under max. load. If the voltage is
dropping below 10V under max. load, bad connections may be acting like resistors
and causing larger voltage drops than expected. Check voltage drops with system
under load at different locations between the liftgate and battery source, to locate
bad connections along the battery cable. Trace ground cable connections also to
locate improper connection(s) along the ground path. Make sure the ground cable is
installed going from the 5/16 tapped hole in the aluminum pump base marked GND
to the liftgate mounting plate (scrape paint to bare metal for good ground). The
ground cable from the batteries to the frame must be a heavy 2ga. cable that is
connected to bare metal on the frame. Replace any damaged cables and repair any
bad connections
d. Defective or
undercharged
battery(ies)
If proper voltage is not present, load test batteries and replace any defective
batteries. The battery(ies) on the vehicle should be that which has a minimum
180-amp reserve capacity.
e. Defective or improperly
wired raise switch
Check voltage on the black wire of the control cord near the switch. If no voltage is
present the black wire from the motor start solenoid is loose or broken and needs
repaired. If voltage is present then check for voltage at the white wire on the switch
with the switch in the “UP” position. If no voltage is present, replace the switch.
f. Defective or improperly
wired solenoid start
switch
Check for voltage on the white wire at the motor start solenoid when the switch is
activated “UP”. If no voltage exists the white wire is loose or broken between the
switch and the motor start solenoid. Check that the purple ground wire on the start
solenoid is connected properly and there are no bad connections. If there is voltage
on the white wire and the coil does not energize or if there is no voltage on the motor
side of the solenoid or a large voltage drop present across the large terminals of the
motor start solenoid then replace the motor start solenoid.
g. Defective pump motor With the switch activated in the “UP” position and the motor start solenoid activated,
check for voltage (10V minimum) at the motor terminal. If proper voltage is present
and the motor is not running, double check the motor ground (see correction c.
above.). If the motor has proper voltage and good ground and does not run, replace
the motor.
25.