MASSEY FERGUSON MF230 Shop Manual page 10

SERVICE MANUAL
dirt. Disconnect drag links from both pit­
man arms, remove the six retaining
screws, then lift the steering gear from
the tractor.
Reinstall reversing the removal pro­
cedure. Be careful to connect wires to in­
struments co1·rectly. Bleed the hydraulic
system as outlined in paragraph 6 after
all lines are connected. Be sure that
pump is not allowed to operate without
fluid.
12. OVERHAUL. To overhaul the
removed unit, unbolt right side pinion
housing (49-Fig. 12) and remove pitman
shaft. (48), housing (49) and related parts.
Turn unit over and drain oil from hous­
ing, then unbolt and remove the left pin­
ion housing (44), pitman shaft (36) and
related parts. Mark control valve head
(1), valve body (14), bearing housing (20)
and steering gear housing (34) before
disassembly to facilitate
reassembly. Unbolt and remove control
valve housing, head, bearing housing,
steering shaft and rack unit. Unscrew
piston (27) and rack (32)
shaft (31), then remove bearing housing
(20).
1b disassemble control valve and steer­
ing shaft., use caution and carefuJly iden·
tify parts as they a1· e removed. Some
parts used may be slightly different than
shown in Fig. 12. Remove top snap ring
(3), washer (4) and seal (5). Remove sec·
ond snap ring (3) and lift parts (6,7,8,9
and 10) from shaft. Remove valve body
(14) from valve spool (18). Be careful not
to lose or damage parts of plungers (11).
Remove return fitting and adapter (17),
being careful not to lose check ball (15).
Pitman shafts (36 and 48) and related
parts can be withdrawn from housings
(44 and 49) after snap ring (37) is re­
moved as shown in Fig. 13.
Inspect all parts for wear or damage
and renew if necessary. Install new seal
(2-Fig. 12) in head (1) with lip of seal
towards valve body and end of seal flush
with edge of housing bore. Press new
bushings (35 and 45) into housings un­
til flush to 0.8 mm (1/32 inch) below
flush with outer edge of bore. Lips of
seals (46) should face inward. Some
models use a washer and snap ring to re­
tain seals (46) in housings. When renew­
"0"
ing rings (21 and 29) and seals (22
and 30) in bearing housing, be sure
rings are installed under the seal rings.
Assemble lower snap ring (3), washers
(6,8 and 10), bearings (9) and spool (18)
onto steering shaft. Install shims (7) un­
til upper snap ring (3) will just fit into
groove in shaft. End play of spool (18) on
shaft must be less than 0.076 mm (0.003
inch). Remove upper snap ring, washers
and thrust bearing from shaft after cor­
rect end play is obtained. Install check
ball (15) and fitting (17) in valve body.
Temporarily thread piston (27) and rack
(32) onto shaft (31). Install lower snap
ring (3), lower
and valve spool (18) onto shaft. The
groove inside valve spool (18) must be
towards top
Install
plungers (11), then carefully install valve
body (14). Install upper thrust bearing
(10,9 and 8), shims (7), washers (6) and
snap ring (3). The centering springs will
make it difficult to install the snap ring
into its groove, however, a 25x110
(1x4-1/4 inch) piece of pipe can be
as shown in Fig. 14 to push snap ring in-
correct
a unit from
as
"0"
Fig. 12-Erploded view of power steering gear available on 111 MF230 models. all
I Hee d usy
2 Seal
3
Snap nnp
4 WuMr
6
Nylon teal
6
Weahera
7 Shtml
9 Bcanng
10
Thrun wuh<r
II Plunger
12
Sprmg
13
Ball
thrust
bearing (8,9 and 10)
(stee ring
wheel) end of shaft..
centering springs (12)
cepl Orchard end MF245 Vineyard models.
body
14 Valve
16 Ball
16 ·o·· nnp
17 Adepur
Ill Valve tpoo l
·o··
19
nn11
25
20
Burmg houomg
21 ··o··
rma
22
Seal nnil
23 ··o·· nng
24 Beanng
Valve
to place. Install washer (4-Fig. 12) with
chamfer down over snap ring. Install top
snap ring (3). Remove piston and rack
from shaft.
Install bearing housing (20)
being sure that
and aligned with corresponding holes in con·
trol valve body. Install piston and rack
onto shaft. Install head (1) over shaft
aligning scribe marks made prior to
disassembly.
Install control valve, steering shaft,
piston and rack assembly into the steer·
mm
used
ing gear housing as shown in Fig. 15.
careful not to damage piston seal ring,
26 Screwo
27 Puu>n
28. Puu>n
nn11
29. ··o·· nnr
30. Seal nng
SU!enng ahan
31
Rack
32.
33. Plug & ··o·· r.ng
34. Hou11ng
35. Bu1hmg
36. Len p•lman thaft
37 Snap ring
1 2
Paragraph
over
shaft
"0" (R)
rings at are
Be
39 Bearlni
Shu" "
MF235
models ell·
38 S pa<eT
40
41 Covu
42 Snap nnc
43. ··o··
nng
H Len ptnion hout�ng
46
Buthmg
46 Seal
arm
47 Len ptunan
48 Rleht paman 1han
4 9 RtghL ptni o n houatnll
50 Rtghl pttman arm
1 1