JLG 450AJ Service Manual - Manual (Page 61)

SECTION 2 - PROCEDURES
3120869 – JLG Lift – 2-45
17. Place cover sub-assembly (6) onto ring gear (4),
aligning the pipe plug holes according to the align-
ment prior to disassembly.
18. Place four flatwashers (16) on top of the bolt holes in
the cover sub-assembly.
19. Place shoulder bolts (13) into the four shoulder bolt
holes in cover (6) and tighten by hand.
20. Place the remaining 12 flatwashers (16) onto the
remaining bolt holes in cover (6).
21. Place the 12 bolts into the remaining bolt holes in
cover (6) and tighten.
22. Torque the shoulder bolts (13) 25 to 34 Nm (18 to 25
ft.lbs.). Torque bolts (12) 25 to 34 Nm (18 to 25
ft.lbs.).
23. Turn hub (1G) over onto its side. Insert coupling (14)
into the end of the spindle (1A).
24. Roll test the unit in both clockwise and counterclock-
wise directions. Perform the same number of turns
in each direction as the ratio of the unit. The ratio is
the last two digits of the model number on the unit’s
ID tag.
25. Leak test the unit at a pressure of 0.3 Bar (5 psi) for 2
to 3 minutes.
2.19 DRIVE BRAKE (AUSCO)
Disassembly
1. With the shaft protrusion downward, disassemble
the parts in the following order; bolts (24) alternately,
washers (23), power plate (21), and gasket.
2. Remove the following parts; stationary discs (14),
rotating discs (12), primary disc (11), torque pins (3),
springs (8&9), and the spring retainer (7).
NOTE: If the bearing and seal are removed for any reason
both must be replaced.
3. Further disassembly is not recommended and
should not be attempted unless necessary to
replace the bearing (4), the seal (6), or the shaft (10).
If further disassembly is needed, proceed as follows;
a. The shaft (10) may be removed by pressing on
the end of the shaft with a shop press.
b. Using an appropriate tool, pry the seal (6) out
from the inside of the brake. Take care not to
damage the bore. Remove the retaining ring (5).
Tap the bearing (4) out with a plastic mallet.
4. Remove the piston (15) from the power plate (21) by
introducing low pressure air into the hydraulic inlet
and make sure the piston is directed away from the
operator. Remove the o-rings (17&19) and backup
rings (16 & 18) from the piston O.D. and I.D.
grooves. Do not remove backup rings (16 & 18)
unless replacement is necessary because they will
be damaged.