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SERVICE MANUAL
0.2232 inch). Maximum diameter of seat
in ball valve is 4.32 mm (0.170 inch).
"0"
All
r ings should be soaked approx·
imately one hour in hydraulic oil before
assembling. Install new back-up washer
"0"
(22) and
ring (23) on ball valve seat
(21), then install in bore of housing. In
"0"
stall new
ring (18) on plunger guide
(19), then insert plunger guide into bore
with cross drilled hole toward ball valve
seat. Insert ball (20A) into bore and
make sure it enters bore of guide (19).
Install plunger (20) with tapered (small)
end toward ball. Install spring support
(17) with large flat end against plunger
guide (19). Apply two or three drops of
Loctite 242 on threads of spring guide
(16), then install and tighten to 20-40
N · m (15·30 ft .
.
lbs.) torque. Insert sec·
3. "0"
I.
Cap
Pin
2 Clip
4.
Fig. 240-Exploded view of valve chamber end
associated parts.
l Paston rm�
2 Poston
3 Chamber
4 "0" nng•
5.
lnle� valve
6.
Spr�ng
ondary relief valve (26), discs (27), if so
equipped, spring (28) and retainer (29)
into bore in bottom of housing. The re·
tainer is a light press
installed flush with mounting surface of
valve body (24). Install orifice plug {12),
diaphragm (11), spring (10), cover (9),
valve
lever (2) and related parts.
all
228. CONTROL V ALVE. The
1b
is serviced
which consists of rod (12-Fig. 239) and
parts (21 through 32).
disasse m ble the valve and oscillator
valve
assembly
ring (16) from internal groove in
oscillator housing (7) and withdraw
from oscillator unit. Remove re
taining ring
6. Osc:IUator drive
ring
rings
6. Snap
Fig. 241-Exploded view of
Intake housing and related
parts. Servo valve (SV) Is at
tached to rear body (33) by
1 Seal
2. Reuuner
3. Sprmg
4. Cap
5.
Snap r1ng
6 Gasket
7 Snop nng
8 Wosher
9 "0" ring
10 Valve
1 1 . R1nll
12 Pon
13 Buah1ng
14 Spring
15. Ball
16. Ret.amer
17. Buahmg
18 Washer
19 Lever
20
Spring
21. "0" rmgs
22. "0" nngs
7
Outlet valv•
23 S<rew1
8. Spring
24. S.rews
"
"
33 Reor body
9
0
nng
34 Intake houSJng
10 Ba<k · up
nng
I I
Plug
35. Filter
36 Filter
12 Snap rmg
fit
and should be
control
as
a matched assembly
,
unseat and remove retaining
while
(8)
compressing
Fig. 239-Exploded view of
hydraulic pump control valve
end camshaft driven osc/1·
fetor assembly.
7 0&<:JI!at.or
8. Snap nng
9. Collor
10. Gu1de
11. Spring
12 Rod
13. Rollen<
14 Pin
15 Dioc
16. Sn&p nng
17. Wuher
18. Spacer
19 Wuhor
20.
"0'' nnll
21. Snap nn11
22 Washer
23. P10
24 Valve IJIOO I
25. Valve ol<'<'V�
26 Washer
27 "0" rinK
28. Sprmg
29. Snop rin11
30 Collar
31 "0" nng
32 Rod
nut (N).
37 "0" rmg, washer
38 Gasket
39 Cover
40 Roto1ner
housing
chp
41 Le\·er ussy
Paragraphs
spring (1 1). Push rod (12) in and remove
snap ring (21), then withdraw remain·
ing parts.
Assemble by reversing disa o;sembly
procedure. End of valve spool (24) with
narrow slot. should be toward oscillator
rod (32); end wit.h larger slots should
toward actuating rod (12). Install sleeve
(25) in rear body bore so roll pin (23) is
down near bottom.
229. VALVE CHAlVIBERS. Both valve
chambers (19-Fig. 237J are identical
and interchangeable, and each contains
Y..
two sets of valve components (5 through
12-Fig. 240). To disassemble t.he
chamber, remove snap ring (12) and
thread a
inch UNC bolt into plug (11)
to provide leverage. Plug can be pulled
by hand. A resealing reamer (Tool No.
N-6007 Al is available which dresses
both seats in one bore at the same time.
If tool is used, remove only enough metal
to smooth the seats. All parts are
available individually.
When installing, do not compress re·
tainer plug (11) deeper than
(0.23 inch) from top of plug to top of
valve chamber. Be sure to pull plug up
against snap ring (12l after snap ring is
seated.
INTAKE
230.
response control valve and noru·eturn
valve are contained in the intake hous·
ing (5-Fig. 237). Refer
exploded view of intake housing and
related parts.
When reassembhng, be sure
(8)
(9), washer
and retaining ring (7) are
con·ectly installed on cover platE• (39). In
stall ring (11) on nonreturn valve (10),
•pr1n1:
&
e
'II
228
- 2 3 0
be
5.8
mm
to
HOUSING.
The
Fig. 241 for an
"0"
ring
2 1
89
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