Table 6-2. Trouble Shooting Continued
CONDITIONS
POSSIBLE CAUSE
CORRECTION
Oil leaks from housing
continued.
3.
Too much oil.
3.
Drain excess oil.
4.
Damaged gasket.
4.
Replace gasket.
Load drifts down.
1.
Brake set for rotation
1.
Test for proper brake
opposite that required
assembly (assume adjust-
for application.
ment is proper).
2.
Safety brake out of
2.
Turn adjusting bolt clock-
adjustment.
wise 1/4 turn or until load
3. Safety brake has become
does not drift.
worn.
3.
Replace brake disc.
6-7 MAINTENANCE OF WORM BRAKE
6-7.1
Disassembly of the Worm Brake. (Figure 6-2.) Remove the drain plug located in lower side of gear housing and
drain the oil from the gear housing.
a.
Back off the lock nut, then the adjusting screw, both two turns or more by turning them counter-clockwise.
b.
Remove the cover mounting screws.
c.
Remove the cover along with coil spring and leaf spring.
d.
NOTE: Which slots balls are in. Remove the retainer plate, composition brake disc, cam plate, and balls.
e.
Inspect parts as follows:
(1) Composition brake disc are 1/4" thick when new. Replace if thinner than 3/16 or if surfaces are glazed or burned.
(2) Inspect the flat, ground surface of the cam plate for glazing, warpage or other damage. Glazing can be removed
by scraping carefully.
(3) Inspect the flat, ground surface of the retainer plate, same as described in step 2.
(4) Inspect the leaf spring. It should be bowed 1/8".
6-7.2 Reassembling And Checking the Brake. (Figure 6-2).
a.
Press brake hub into place over worm shaft and key.
b.
Assemble balls into appropriate slots of cam. Use stiff grease to hold balls into place and slide cam over end of
worm. Be sure that balls are secure, between cam slots and hub slots.
6-6
