HYDRAULIC VALVE

LEGEND FOR FIGURE 5-138

33.

C-washer

Back-up ring

17.

1. Valve assembly

34.

Spool

O-ring seal

18.

2. Inlet section

35.

Plug, check valve

Relief valve plug

19.

3. Inlet body

36.

Back-up ring

Cap seal

20.

4. Screw

37.

Valve plug seal

Relief valve spring

21.

5. Sleeve retainer cover

38.

Check valve spring

Relief valve assembly

22.

6. Sleeve

39.

Check valve ball

Plug

23.

7. Spring cover seal

40.

Back-up ring

O-ring seal

24.

8. Lower spool seal

25.

41.

O-ring seal

Stud nut

9. Centering spring

42.

Outlet section

Tie stud

26.

10. C-washer

43.

Outlet body

Screw

27.

11. Valve spool

44.

Seal retainer

Sleeve retainer cover

28.

12. Plug, check valve

45.

Seal

Sleeve

29.

13. Back-up ring

46.

Seal

Spring cover seal

30.

14. Valve plug seal

47.

Seal

Lower spool seal

31.

15. Check valve spring

Centering spring

32.

16. Check valve ball

f. Screw out the plug which retains

5-129

HYDRAULIC VALVE

the relief valve and remove the O-ring

5-130

DISASSEMBLY. Refer t o f i g u r e

from the plug.

Remove the spring and

5-138 and proceed as follows:

the relief valve.

Remove cowl access hole cover

fasteners and cover plate, remove

5 - 1 3 1 CLEANING AND INSPECTION.

lower dash panel fasteners and lower

dash panel.

a. Discard all old seals. Wash all parts in a clean

Be sure the valve is not sub-

m i n e r a l oil solvent and place them on a clean

ject to pressure.

Disconnect and cap

surface for inspection.

all lines and disconnect linkage to

the spools.

Remove valve mounting

b . Carefully remove burrs by light stoning or

fasteners and remove valve from

lapping. Be certain there is no paint or burring on

machine.

mating surfaces of valve bodies.

NOTE

c. Inspect the valve spools and bores for burrs

During disassembly, particular atten-

and scoring. If scoring is not deer enough to cause

tion should be given to identification

of parts for reassembly.

Spools are

objectionable leakage, the surfaces can be stoned

selectively fitted to valve bodies and

or polished with crocus cloth. If scoring is

must be returned to the same bodies

excessive, the valve body and spool must be

from which they were removed.

Valve

r e p l a c e d . Check the valve spool for freedom of

sections must be reassembled in the

movement in the bore.

same order.

Attaching Parts:

Remove the tie

d. Check the relief valve for smooth movement in

studs and nuts and separate valve

its bore. The valve should move from its own

sections.

weight.

Slide the spool out of its bore

5-132 REASSEMBLY.

and remove the O-rings from the grooves

in the spool and from the valve body

a. Install the O-ring on the relief valve plug. Place

around the spool bore.

Do not remove

the relief valve assembly in its bore, hex nut end

the centering spring and "C" washers

up. Install the spring and plug and tighten the plug

unless it is necessary to replace them.

securely but DO NOT over tighten.

Grip the stem of the check valve

plug with pliers and pull it out of the

Remove the O-ring and back-

valve body.

up ring.

Remove the spring and ball

from the valve body.

5-94B