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TM 5-2420-222-34
11-3.
STEERING VALVE ASSEMBLY MAINTENANCE.
NOTE
Steps 8 and 9 applies only to loader backhoes with serial numbers 319995-342573.
8.
Remove setscrew (29), valve seat (27), bearing ball (25), and retainer (24) from valve housing (8).
9.
Remove two preformed packings (26 and 28) from valve seat (27). Discard preformed packings.
10.
Using retaining ring pliers, remove retaining ring (2) from valve housing (8).
11.
Remove packing retainer (3) with assembled parts, two bearing seats (6), and retainer and roller (7) from valve
12.
Remove three preformed packings (1, 4, and 5) from packing retainer (3). Discard preformed packings.
b.
CLEANING AND INSPECTION
WARNING
•
Dry cleaning solvent, P-D-680, is toxic and flammable. Always wear protective
goggles and gloves, and use only in a well-ventilated area. Avoid contact with
skin, eyes, and clothes, and DO NOT breathe vapors. DO NOT use near open
flame or excessive heat. The solvent's flash point is 100°F-138°F (38°C-59°C). If
you become dizzy while using cleaning solvent, immediately get fresh air and
medical help. If solvent contacts eyes, Immediately wash your eyes and get
medical aid.
•
Compressed air used for cleaning or drying purposes, or for clearing
restrictions, should never exceed 30 psi (207 kPa). Wear protective clothing
(goggles/shield, gloves, etc.) and use caution to avoid injury to personnel.
1.
Clean all metal parts with dry cleaning solvent and rags. Dry thoroughly with compressed air.
2.
Inspect all metal parts for cracks, breaks, and abnormal bends.
3.
Inspect drive shaft for cracks, corrosion, chipped or missing gear teeth.
4.
Inspect valve housing for damaged threads.
c.
REPAIR
1.
Remove any corrosion from drive shaft (21) using 600 grit abrasive cloth.
2.
Restore damaged valve housing (8) threads using screw threading set.
d.
ASSEMBLY
NOTE
Steps 1 and 2 apply only to loader backhoes with serial numbers 319995-342573.
1.
Coat two new preformed packings (26 and 28) with hydraulic fluid. Install preformed packings on valve seat (27).
2.
Install retainer (24), bearing ball (25), valve seat (27) with assembled parts, and setscrew (29) in valve housing (8).
Torque setscrew to 100 lb.-in. (11.3 N•m).
11-20
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