General; Special Precautions - Yale 524150797 Maintenance Manual

1600 YRM 1504
The control handle assembly is designed to perform
several functions. The standard control handle
includes the speed/direction control and buttons for the
horn, traction reversing, and hydraulic functions. The
control handle is connected to the Master Drive Unit
(MDU) and is used to steer the truck as it turns the
WARNING
The capacitor in the controller can hold an
electrical charge after the battery is disconnected.
To prevent electrical shock and personal injury,
discharge the capacitor before inspecting or
repairing any component. Wear safety glasses.
Make certain the battery has been disconnected.
DO NOT use a screwdriver to discharge the
traction motor controller.
WARNING
To avoid personal injury and prevent electrical
shock, perform the
performing any troubleshooting or adjustments,
and connecting or disconnecting a handset or PC.
CAUTION
To avoid controller damage, always disconnect the
battery. Discharge the capacitor and never put
power to the controller with any power wire
disconnected. Never short any controller terminal
or motor terminal to battery. Make sure to use
proper procedures when servicing the controller.
1. Move the truck to a safe, level area. Turn the key
switch to the OFF position and disconnect the
battery.
2. Remove the drive unit compartment cover to
access the drive unit compartment.
CAUTION
DO NOT short across the motor controller
terminals with a screwdriver or jumper wire.

Special Precautions

following steps before

General

MDU. Move the control handle left or right to turn the
drive/steer tire and steer the truck. Controls mounted
in the handle are linked to the control panel by a wiring
harness that passes through the center of the handle.
The brake is applied when the handle is in the full up
or down position.
3. Discharge the capacitors in the controllers by
connecting a 200-ohm, 2-watt resistor across the
controller's B+ and B− terminals using insulated
jumper wires. See Figure 1.
1. CONTROLLER
2. POSITIVE CONNECTION
3. INSULATED JUMPER WIRES
4. 200-OHM, 2-WATT RESISTOR
5. NEGATIVE CONNECTION
Figure 1. Discharging Controller
General
1