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TM 9-5130-338-12&P
4-15. RELIEF VALVE ASSEMBLY REPLACEMENT.
This task covers:
a. Removal
b. Inspection
c. Installation
INITIAL SETUP
Tools
Equipment Conditions
Tool kit, general mechanic's (SC 5180-90-CL-N26)
Hydraulic impact wrench disconnected from power
Wrench, 1-1/2-in.-comb (5120-00-227-8834)
source.
Hydraulic impact wrench secured in vise with soft-jaw
Materials/Parts
caps; impact head assembly facing upward.
Cloth, cleaning (Appx. C, item 5)
Trigger assembly removed (see para. 4-14).
Oil, lubricating (Appx. C, item 13)
Packing, preformed (Appx. F, item 5)
Packing, preformed (Appx. F, item 8)
Solvent, dry-cleaning (Appx. C, item 16)
a.
Removal.
WARNING
Exercise extreme care when removing spool cap (1) due to spring force. Injury to personnel
could occur if spring force is released quickly.
1. Remove needle roller (2), spool cap (1), and two preformed packings (3 and 4). Discard preformed packings.
NOTE
Do not attempt to remove valve sleeve (5).
2.
Remove valve spool (6), relief seat (7), relief poppet (8), two springs (9 and 10), and spring rest (11) from
main housing (12).
b.
Inspection. Inspect valve spool components in accordance with paragraph 4-19.
c.
Installation.
CAUTION
Damage to equipment could occur if valve spool components are not alined properly during
Installation.
1.
Insert relief seat (7) into valve spool (6) until notches in relief seat engage strut of valve spool.
2.
Install spring (10), spring rest (11), spring (9), relief poppet (8), and valve spool (6) with relief seat (7) in
main housing (12).
3.
Lubricate two new preformed packings (3 and 4) with clean lubricating oil and install preformed packings.
4-14
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