Oshkosh Corporation JLG 450AJ, Service And Maintenance Manual

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SECTION 3 - CHASSIS & TURNTABLE
3-20 – JLG Lift – 3121659
Shaft Seal Replacement
REMOVAL
1. Remove snap ring (1) and support washer (2).
NOTE: To avoid damaging shaft during removal, install a large
sheet metal screw into chuck of a slide hammer. Drive
screw into seal surface and use slide hammer to pull seal.
2. Carefully pry out and discard shaft seal (3).
INSPECT COMPONENTS
Inspect new seal, motor housing seal bore, and sealing area on
shaft for rust, wear, and contamination. Polish shaft and clean
housing if necessary.
INSTALLATION
1. Cover shaft splines with an installation sleeve to protect
shaft seal during installation.
2. Install a new shaft seal (3) with cupped side facing
motor. Press seal into housing until it bottoms out. Press
evenly to avoid binding and damaging seal.
3. Install seal support washer (2).
4. Install snap ring (1).
5. Remove installation sleeve.
Loop Flushing Valve
REMOVAL
1. Remove plug (1) and (2) with 11/16" internal hex wrench.
Figure 3-9. Loop Flushing Spool
2. Use 1/4" in hex wrench to remove plug (3).
3. Remove O-rings (4, 5, and 6).
4. Use pliers to remove centering springs (7, 8, and 9).
5. Remove spring retaining washers (10 and 11).
6. Remove shift spool (12).
7. Remove orifice poppet (13).
8. Inspect new O-rings and sealing area for rust, wear, or con-
tamination. Check springs and poppet for wear.
INSTALLATION
1. Install orifice poppet (13).
2. Install shift spool (12).
3. Install spring retaining washers on springs (10 and 11).
4. Carefully install centering springs (7, 8, and 9).
5. Install new O-rings (6, 4, and 5).
6. Use 1/4" hex wrench to torque plug (3) to 20 ft-lb (27 Nm).
7. Use 11/16" internal hex and torque plugs (2 and 1) to
27 ft-lb (37 Nm).
1
2
3
1. Snap Ring
2. Support Washer
3. Shaft Seal
Figure 3-8. Removing Shaft Seal
1. Plug
2. Plug
3. Plug
4. O-ring
5. O-ring
6. O-ring
7. Spring
8. Spring
9. Spring
10. Washer
11. Washer
12. Shift Spool
13. Orifice Poppet