JLG 450A_AJ Series II Service Manual - Manual (Page 98)

SECTION 3 - CHASSIS & TURNTABLE
3-48 – JLG Lift – 3121180
Loop Flushing Valve
REMOVAL
1. Use an 11/16" internal hex wrench to remove plug
(1) and (2).
2. Use a 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).
INSPECT COMPONENTS
Inspect new O-rings and sealing area for rust, wear, or
contamination. 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 a 1/4" hex wrench to torque plug (3) to 20 ft-lb
(27 Nm).
7. Use an 11/16" internal hex and torque plugs (2 and 1)
to 27 ft-lb (37 Nm).
2
6
9
11
1
4
8
10
12
5 3
7
13
(37 Nm)
27 ft.lbs.
11/16 in
(37 Nm)
27 ft.lbs.
11/16 in
(27 Nm)
20 ft.lbs.
5/8 in
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
Figure 3-26. Loop Flushing Spool