SUBSECTION 8F
BOOM HOIST PAWLS
ADJUSTMENTS. To prevent a live boom condition from oc-
C. Make certain the boom hoist drum pawl is fully en-
curring when both pawls become disengaged from the
gaged in the ratchet teeth, and the length of the pawl
ratchets as the linkage crosses the neutral positron, adjust
spring "A" is approximately 2-1/16 inches. Adjust to
the pawls as follows (see Figure 8F-3):
this dimension by means of adjusting nut "A", if neces-
sary.
1. Make certain that the pawls pivot freely on support pin
(57).
NOTE
2. With the boom hoist control lever in the neutral posi-
The length of pawl spring "A" may vary slightly. How-
tion, perform the following checks and adjustments.
ever, the length of pawl spring "B" must be exactly 1-
3/4 inches. This applies to both pawls. Maintain this
A. The clearance between the pawl cylinder spring guide
dimension by turning adjusting screw "B" in or out as
and the support bracket should be 0.132 inch. Adjust to
required.
this dimension by loosening the jam nut and turning the
spring guide. Tighten the jam nut to the spring guide.
D. The planetary pawl must clear the ratchet teeth by a
minimum of 1/8 inch. Adjust to this dimension by
B. The distance between the pivot pin and the end of the
means of adjusting nut "A", if necessary. Refer to the
support bracket should be 3 inches. Adjust to this di-
note in step C if any adjustment was made.
mension by means of the jam nut and the pivot yoke.
3. With the boom hoist control lever in the lowering posi-
NOTE
tion. perform the following checks and adjustments.
All the pins except pin (22) must be removed to allow
A. Make certain the planetary pawl is fully engaged in the
lever (50) to swing clear of yoke (48). Turn the yoke to
ratchet teeth. The length of pawl spring "A" should be
the proper setting.
Figure 8F-3. Adiust Boom Hoist Pawls (2100J1008)
8F-4
