6.4
CLUTCH-BRAKE ADJUSTMENT
The combination clutch and brake actions to raise rated loads with the clutch handle are adjusted at the factory. If field
adjustments are needed, proceed as follows. Refer to Figure 6-1 for adjustment details.
1.
The Dacron brake holds the load when the clutch lever is released. If the load drifts down, tighten the nut at the base
of the #24 spring to compress this spring. This increases the initial load on the brake lever. Note that the #24 spring
should be compressed to about 3 1/8
±
1/16 inches with about 3/8 inches movement on the bottom edge of the #8
brake differential.
2.
Excessive tightening fully compresses the spring and the brake will not release. There should always be a 1/32 inch
gap between brake lever #3 and nuts “B” and “C”. If this “play” in brake lever #3 is absent, you can flex the rod and
break it.
3.
If the load still drifts down move the brake rope end “D” from the outer hole to the inner hole on the #8 brake
differential. As the Dacron brake wears, the brake lever may need adjusting to bring the lever up to its proper
operating position. Alternate holes are provided in the brake rope ends for this purpose.
4.
When properly adjusted, the brake will release before the #10 clutch spring is entirely compressed. Gap “A” is
widened or narrowed by screwing or unscrewing, respectively, nuts “B” and “C”. Make this adjustment carefully. If
there is no gap “A”, the brake will release before the clutch belt is tightened. This will cause a sudden jerking before
the clutch belt is tightened, resulting in an overload on the hoist, wire rope, and track. The clutch can be engaged
sooner to help avoid this overloading by tightening the top nut on the #10 clutch spring shown in Figure 8-1. The
clutch spring is preset at the factory to a compressed height of 1 11/16 inches.
11
Figure 6-1.
Clutch-Brake Adjustment Detail
