JLG 40H Service Manual User Manual
Page 93
SECTION 2 - PROCEDURES
3120240
– JLG Lift –
2-73
3.
Remove o-ring 31, square ring 30, pipe plug 28 and
bleeder screw 38 from end cover.
4.
Remove piston 35 from end cover by inserting two
1/4-20 UNC bolts into threaded holes in piston. By
turning and pulling, piston can be removed from
bore.
5.
Remove o-ring 33, back-up ring 34, o-ring 36 and
back-up ring 37 from piston 35.
6.
Remove separators 43 from housing 50.
7.
Remove shaft assembly, consisting of shaft 39, discs
40,44, friction discs 42,springs 41, and bearings
32,48,from housing by pressing or using a soft mal-
let on male end of shaft.
8.
Remove springs 41 from between tabs of discs
40,44.
9.
Remove bearings 32,48 from shaft using an appro-
priate bearing puller. The discs and friction discs will
then slide off either end of shaft.
10.
Remove dowel pins 47, springs 45,46 and oil seal 49
from housing 50.
Inspection.
1.
Clean all parts thoroughly.
2.
Closely inspect all parts for excessive wear, cracks
and chips. Replace parts as necessary.
3.
Discard seals and o-rings.
4.
Closely inspect bearings and bearing contact sur-
faces. Replace as necessary.
NOTE: Bearings may be re-used if, after thorough inspec-
tion, they are found to be in good condition.
Assembly.
NOTE: Lubricate all seals and o-rings with clean hydraulic
oil prior to assembly.
1.
Insert new oil seal 49, dowel pins 47 and springs
45,46 in housing 50.
2.
Install new bearing 48 on male end of shaft 39 and
press until it shoulders on shaft.
3.
Insert shaft and bearing on housing 50 and press
until bearing bottoms on shoulder in housing.
4.
Position large diameter disc 44 in housing, with tabs
guided by dowel pins 47, until disc rests on springs
45,46.
DISC 15,19 AND FRICTION DISCS 17 SHOULD REMAIN DRY DUR-
ING INSTALLATION. NO OIL RESIDUE SHOULD BE ALLOWED TO
CONTAMINATE DISC SURFACES.
Figure 2-40. Drive Brake Assembly - Mico (Machines Built Prior To May 1992).