JLG 1850SJ Service Manual - Manual (Page 265)

SECTION 5 - BASIC HYDRAULIC INFORMATION & HYDRAULIC SCHEMATICS
3121619 – JLG Lift – 5-95
Disassemble Pump
1. Remove coupling (11) from endcap (34).
2. Remove four capscrews (43) and control assembly (42)
from endcap (34).
3. R e m ove a n d d i scard four 0- rin gs (37) .
4. Remove four capscrews (33) and endcap (34). Keep valve
plate (26) from falling off.
5. Place endcap and valve plate in a clean area to protect
from contamination.
6. Remove bearing cup (29) bearing cone (28) and 0-ring
(25)
. Discard 0-ring.
7. Set housing on side to allow fluid to drain.
8. Prevent shaft (8) from moving. Remove cylinder block
assembly (20) from housing (11).
9. Set cylinder block on a clean dry surface.
10. Position pump with shaft pointing down.
11. Pull shaft (8) from housing (11).
12. Compress bias spring (3). Rotate servo piston assembly
(2) towards swashplate (4).
13. Lift swash plate/servo piston assembly up at an angle
and remove it from housing.
14. Remove snap ring (6), clevis pin (5), servo piston (2), and
bias spring (3) from swash plate (4). Discard snap ring.
15. Remove three O-rings (1) from servo piston (2). Discard
O-rings.
32
34
43
37
42
Figure 5-120. Coupling and Control Removal
11
25
26
28
33
34
29
27
Figure 5-121. Endcap Removal
20
11
8
Figure 5-122. Cylinder Block Removal
1
2
3
4
5
6
8
11
Figure 5-123. Swash Plate and Servo Piston Removal