General; Description - Yale 524150797 Maintenance Manual

1800 YRM 1505
WARNING
DO NOT operate a lift truck that needs repairs. If a
repair is necessary, put a DO NOT OPERATE tag
on the control handle. Remove the key from the
key switch.
WARNING
Before performing repairs or adjustments on the
brake system, blocks must be placed under each
side of the frame to raise the drive tire off the
ground. The blocks must prevent the lift truck
from falling and causing personal injury or
property damage. See Periodic Maintenance
Motorized hand trucks have three methods of braking:
1. Regenerative (Neutral) braking
2. Controlled plugging
3. Application of the spring-applied, electrically-
released friction brake
NOTE: The preferred method of stopping the truck is:
Regenerative (Neutral) braking
or
Controlled plugging
Regenerative (Neutral) braking applies a retarding
force to the drive wheel through the traction motor, al-
lowing the unit to slow to a gradual stop. It is applied
by returning the speed/direction control to the NEU-
TRAL position.
Controlled plugging is reversing the speed/direction
control while traveling, causing the unit to slow to a
stop. Return the speed/direction control to the NEU-
TRAL position to remain stopped. If the speed/direc-
tion control is not returned to the NEUTRAL position,
the lift truck will accelerate in the opposite direction.
Controlled plugging should stop the truck within one
to one and a half truck lengths, depending on speed
and load.

General

8000YRM1510
8000YRM1666 - How To Put A Lift Truck On
Blocks.
WARNING
Always disconnect and separate the battery
connector so that the connector is completely
free before performing any service or repairs. If
the connector is not completely free, it can
reconnect.
CONNECT.
This section describes the electric brake and outlines
the procedures for the maintenance and repair that
may be required for servicing this truck.

Description

The brake is designed to hold the truck loaded to ca-
pacity on a 10% grade. The lift truck should be tested
periodically to ensure that the brake is performing to
the proper specifications. See Brake Check in this
section for testing instructions. If the brake does not
release or fails to perform to the necessary require-
ments, the brake assembly must be repaired or re-
placed. Refer to Brake Assembly Repair in this sec-
tion for procedures to repair or replace the brake.
A spring-applied, electrically released friction brake is
mounted to the drive motor. When the brake is ap-
plied, springs inside the brake assembly compress a
rotating friction disk against two stationary plates.
When the brake is released, the brake coil will ener-
gize and pull the armature plate away from the friction
disk, releasing the brake as the drive motor is activa-
ted.
The brake is applied when the control handle arm is
moved to the BRAKE ON position, when the truck is
idle for periods of time, or if there is a traction fault.
To release the brake:
1. Connect the battery.
2. Turn the key switch to the ON position.
or Periodic
Tag the connector:
General
Maintenance
DO NOT
1