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HOIST LIMIT SWITCH
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 they reach full exten-
sion, 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 brake
cabinet, to prevent further oil flow to the hoist cylin-
ders.
The switch must be properly adjusted at all times.
Improper adjustment or loose mounting bolts may
cause false signals or damage to the switch assem-
bly.
Adjustment
1. Raise the body so that the hoist cylinders are
within 152 mm (6 in.) of maximum travel.
2. Adjust the hoist limit switch to achieve an air
gap (dimension "A") of 12.70 to 14.30 mm (0.50
to 0.56 in.) between the sensing area and actu-
ator arm (3). Tighten the cap screws.
Service
Keep the sensing area clean and free of metallic dust
and other debris that may damage or inhibit opera-
tion of the switch. If the switch is damaged or not
functioning, the switch must be replaced.
D3-16
FIGURE 3-9. HOIST LIMIT SWITCH ADJUSTMENT
24VDC Electrical System Components
1. Body
2. Frame
3. Actuator Arm
4. Switch Mounting
Plate
5. Hoist Limit Switch
10/06 D03036
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