Special Precautions - Yale 524150797 Maintenance Manual

Description
3. Lower the control handle arm to the operating or
BRAKE OFF position. Refer to Figure 1.
4. Rotate direction/speed control (butterfly knobs) in
the direction of travel.
The friction brake is applied when the key switch is in
the OFF position on ALL trucks.
NOTE: If the battery state of charge is too low, or if
there is damage to the brake, MDU, or electrical sys-
tem, then it may not be possible to move the lift truck
before servicing the truck.
WARNING
Put blocks under each side of the truck under the
drive unit frame. Position blocks on both sides of
the load wheels. The blocks must prevent the lift
truck from falling and causing personal injury or
property damage.
The capacitor in the transistor controller can hold
an electrical charge after the battery is disconnec-
ted. To prevent electrical shock and personal in-
jury, discharge the capacitor before inspecting or
repairing any component. Wear safety glasses.
Make certain the battery has been disconnected.
Discharge the capacitors in the controller by con-
necting a 200-ohm, 2-watt resistor across the con-
troller's B+ and B- terminals with insulated jumper
wires. DO NOT use a screwdriver to discharge the
traction motor controller.
To avoid personal injury and prevent electrical
shock, perform the following steps before per-
forming any troubleshooting or adjustments, and
connecting or disconnecting a handset or PC.
2
A. BRAKE ON
B. BRAKE OFF
C. BRAKE ON

Special Precautions

To avoid controller damage, always disconnect
the battery. Discharge the capacitor and never put
power to the controller with any power wire dis-
connected. Never short any controller terminal or
motor terminal to battery. Make sure to use proper
procedures when servicing the controller.
1. Block the lift truck so the drive wheel is off the
2. Turn the key switch to the OFF position and dis-
3. Discharge the capacitors in the controllers by con-
Figure 1. Brake Operation
CAUTION
floor. See Periodic Maintenance 8000YRM1510
or Periodic Maintenance 8000YRM1666 - How
to Put a Lift Truck on Blocks.
connect the battery.
necting a 200-ohm, 2-watt resistor across the
controller's B+ and B- terminals. See Figure 2.
DO NOT short across the motor controller termi-
nals with a screwdriver or jumper wire. Remove
the 200-ohm, 2-watt resistor before reconnecting
the battery.
1800 YRM 1505