Special Precautions 1800 YRM 1005
Figure 1. Brake Operation
The parking brake is applied when the control han-
dlearmismovedtotheBRAKE ON position (full
up or full down position) or if a traction fault occurs.
The lift truck must meet the applicable HOLD ON
GRADE requirements; the parking brake should be
capable of holding the lift truck on a 10 percent
grade with the maximum rated load.
Special Precautions
WARNING
Block 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 discon-
nected. 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.
Discharge the capacitors in the controller by con-
necting a 200-ohm, 2-watt resistor across the
controller’s B+ and B
terminals with insulated
jumper wires. DO NOT use a screwdriver to dis-
charge the traction motor controller. See Figure 2
or Figure 3.
To avoid personal injury and prevent electrical
shock, perform the following steps before per-
forming any troubleshooting or adjustments, and
before connecting or disconnecting a handset or
computer.
CAUTION
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
procedure when servicing the controller.
1. Block the lift truck so that the drive wheel is off the
floor. Refer to the proper section for your truck:
Periodic Maintenance 8000 YRM 1009, Periodic
Maintenance 8000 YRM 1379, or Periodic Main-
tenance 8000 YRM 1048 - How to Put a Lift Truck
on Blocks.
2. Turn the key switch to the OFF position and discon-
nect the battery.
3. Discharge the capacitors in the controllers by con-
necting a 200-ohm, 2-watt resistor across the con-
troller’s B+ and B
terminals. See Figure 2 or Fig-
ure 3 for your truck. DO NOT short across the mo-
tor controller terminals with a screwdriver or jumper
wire. Remove the 200-ohm, 2-watt resistor before
reconnecting the battery.
2
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