SERVICE MANUAL
FILTER, FLUID AND PUMP
All Models
142.
Tractors may be equipped with Sunstand or
Plessey hydraulic gear type pumps. For information
and service procedures, refer to paragraph 26 for the
pump and to paragraph 21 for filter change and hy-
draulic fluid capacity.
AUXILIARY CONTROL VALVE
All Models So Equipped
143.
R&R AND OVERHAUL. Ib remove the aux-
iliary control valves, apply park brake and block
wheels securely. Remove right rear wheel. On models
without
cab,
unbolt and remove slotted panel on right
side.
On models with cab, disconnect valve linkage.
On all models, clean dirt from valves and surround-
ing area. Disconnect remote pipes from valves, then
unbolt and remove end plate and valves as an assem-
bly. Unpin and remove control levers or control links.
Remove end plate with three cap screws and sepa-
rate valves.
NOTE:
TWo
types of Bosch remote auxiliary vaives
are used. Bosch No. 0521609005 (Fig. 169) is
equipped with two hydrauiic check vaives. Bosch
No.
052169006 (Fig. 170) is equipped with one hy-
draulic check vaive and one mechanical check valve
iocated
Jn
the raise work port. To identify the valves,
check the number on the plate between the work
ports.
Disassembly of both valves is simiiar, except
on vaives so equipped, the mechanicai check vaive
must be removed first to prevent damaging the valve
spooi.
Tb disassemble the valves, refer to Fig. 172 and re-
move fittings from the raise work port. Bend both
ends of retaining clip (33) inward to clear tips on
valve retainer (32). Turn retaining clip clockwise to
clear valve retainer Using needlenose pliers, press
down on valve retainer and rotate it 90 degrees coun-
terclockwise so the ends fit into large grooves in the
HYDRAULIC CHECK VALVE
Paragraphs 142-143
bore.
Remove valve retainer (32), large spring (31),
washer (30) and small spring
(29).
Remove retaining
clip (33), then remove check valve (27) with ball (28)
and actuating pin (26).
On both valves, refer to Fig. 171 or 172 and unbolt
and remove bracket (8) with wiper seal (7) and spacer
ring
(9).
Unbolt and remove detent cover
(25).
With-
HYDRAUUC CHECK VALVE
MECHANCAL CHECK VALVE
Fig. 170Sectlonal view of
Bosch
No. 0521609006 valve
equipped with one hydraulic check valve and one
mechanical check valve.
Fig. 169—Sectional view of
Bosch
No. 0521609005 valve
equipped with two hydraulic check valves.
171—Exploded view of Bosch No
auxiliary valve. Detent assembly not
1.
Snap ring
2.
Plug 14,
3.
Back-up ring 15.
4.
"O" ring 16^
5.
Spring 17
6. Check ball ig,
7.
Wiper seal 19*
8. Bracket . 20!
9. Spacer ring 2I.
10.
Spacer 22.
11.
Back-up ring 23.
12.
"O" ring 24.
13.
Valve body 25.
. 052169005
shown.
Valve spool
Ball
Poppet
Spring
"O"
ring
Collar
**0"
ring
"O"
ring
Back-up ring
Shim
**0"
ring
Detent cover
95
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