HOIST LIMIT SWITCH
The hoist limit switch (5, Figure 3-9) is located inside
the right frame rail above the rear suspension (near the
body pivot pin). The hoist limit switch is designed to
stop the hoist cylinders before reaching full extension,
preventing possible damage to the dump body or hoist
cylinders.
Operation
When the hoist cylinders approach maximum stroke,
and the body pivots on the pins, actuator arm (3)
moves close enough to the magnetically operated
switch to close the electrical contacts. When the con-
tacts close, an electrical signal is sent to the hoist-up
limit solenoid valve (located in the hydraulic compo-
nents cabinet) to prevent further oil flow to the hoist
cylinders.
The switch must be properly adjusted at all times.
Improper adjustment or loose mounting bolts may
cause false signals or damage to the switch assembly.
Adjustment
With body raised and hoist cylinders within 6 in. (152
mm) of maximum travel, make the following adjust-
ment.
1. Adjust limit switch to achieve an air gap (dimen-
sion “A”) of 0.50 to 0.56 in. (12.70 to 14.30 mm)
between sensing area and actuator arm (3).
Retighten capscrews.
Service
Keep sensing area clean, free of metallic dust and other
debris that may damage or inhibit operation of the limit
switch. If the switch is not functioning or damaged the
unit must be replaced.
FIGURE 3-9. BODY LIMIT SWITCH ADJUSTMENT
1. Body
2. Frame
3. Actuator Arm
4. Switch Mounting Plate
5. Hoist Limit Switch
D3-14 24VDC System Components D03019 04/01
To Next Page
Loading...
Need help?
General
