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TM 5-2420-222-34
14-12.
ACKHOE BOOM AND SWING VALVES REPAIR (Con’t).
d.
ASSEMBLY
NOTE
Boom valve has only one anti-cavitation detent plunger; swing valve has two.
Repeat steps 1 through 3 as required to remove second anti-cavitation detent
plunger.
1.
Position spring (25) in detent plunger (24) and coat parts
with hydraulic fluid.
2.
Place valve body (2) in vise with caps. Install detent
plunger (24) and spring (25) in valve body.
3.
Coat new preformed packing (26) with hydraulic fluid.
Install plug (27) and preformed packing in valve body
(2).
4.
Remove valve body (2) from vise.
5.
Coat two new preformed packings (23) and new backup
washers (22) with hydraulic fluid. Install preformed
packings and backup washers in valve body (2).
6.
Install two backhoe boom or swing valve relief valves
from valve body (2) (see paragraph 14-13).
7.
Coat new preformed packing (21) with hydraulic fluid and install in place on spool plug (3).
NOTE
Ensure that sealing surfaces are clean before applying thread sealing compound to
spool plug.
8.
Apply thread sealing compound to threads of spool plug (3).
9.
Wrap valve (4) in clean rag and place in vise. Install spool plug (3) and preformed packing (21) in valve.
10.
Install two fluid flow restrictors (18) in place on two springs (19).
11.
Coat two fluid flow restrictors (18) and two springs (19) with hydraulic fluid and install in place in valve (4).
TA701594
14-64
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