MASSEY FERGUSON MF230 Shop Manual page 16

SERVICE MANUAL
of shims for aid in reassembly. Remove
snap ring (4) and seal assembly (8).
Remove snap ring (13), thrust washers
(14) and thrust bearing (15) from mput
shaft. Drive out pin (18) and withdraw
torsion bar (21) and spacer (20). Place
end of valve spool on top of bench and
rotate input shaft. until drive ring (19)
falls free, then rotate input shaft
clockwise until actuator ball (23) is
disengaged from helical groove in input
shaft. Withdt·aw input shaft and remove
actuator ball. Do not remove actuator
ball retainmg spring (24) unless renewal
is required.
Remove plug <28) and recirculating
ball (26) from valve body. Thoroughly
clean all parts in a suit.able solvent,
visually inspect. parts and renew any
showing excessive wear. scoring or other
damage.
Using a micrometer. measure lhick·
ness of the commutator ring (33) and
commutator (341. If commutator ring is
0.038 mm <0.0015 inch) or more thicker
than commutator, renew the matched
set.
Place the stator-rotor set (31) on the
lapped surface of end cover (38). Make
certain that vanes and vane springs are
installed correctly in slots of the rotor.
Arched back of springs must con·
NOTE:
fV-
tact vanes.
Position lobe of rotor in valley of stator
as shown at Fig. 28). Center opposite
lobe on crown of stator. then using two
feeler gages. measure clearance CCJ be-
26 2 1
1
)�
�-32
,.--
35 1 8
IJ-20
f-
tween rotor lobes and stator. If clearance
is more than 0.15 mm <0.006 inch),
renew stator-rotor assembly. Using a
micrometer, measure thickness of stator
and rotor. If stator is 0.05 mm <0.002
inch) or more thicker than rotor, renew
the assembly. Stator, rotot·, vanes and
vane springs are available only as an
assembly.
Before reassembling. wash all parts in
clean solvent and air dry. All parts,
unless otherwise indicated, are in­
stalled dry. Install recirculating ball
(26-Fig. 27) and plug (281 with new "0"
ring(27l in valve body and tighten plug
to a torque of 14,19
Clamp fitting (installed m valve body
port) in a vise so top end of valve body
is facing upward. Install thrust washer
(14), thrust bearing (15), second thrust
washer (14) and snap ring (13) on input
shaft (17).
If actuator ball retaining spring (24)
was removed, install new retaining
spring. Place actuator ball (23> in its seat
inside valve spoo l (22). Insert input shaft
into valve spool engaging the helix and
actuator ball with a counterclockwise
motion. Use the midsection of torsion
bar (21) as a gage between end of valve
spool and thrust washer, then place the
assembly in a vertical position with end
of input shaft resting on a bench. Insert
drive ring (19) into valve spool until
drive ring is engaged on input shaft
spline. Remove torsion bar gage.
Install spacer (20) on torsion bar and
insert the assembly into valve spool.
Align cross holes in torsion bar and in·
"
21
N ·
m Cl0-14 ft .. Jbs.).
Fig. 27-Exploded view of
steering control valve
assembly (hydrostatic hand
pump) used on 1111ndard
MF245 models.
Nul
l
r�n
4 Sn•p
,
8
Co>tr jupp•:r
9
10
S.al
Wuhtr
II
Sham
12
SIUip
13 nn.:
14 Thruot "••ht·r.
l>t•unn11
15 Thru•1
16 Teflon •PMN
pu ohafl
17 I n t
l� P an
19 Orj-e nnw
20 Spncor
26
bur
21 Toroann
Valve •pc10l
22
Ac:tuaiOr
23
bdll
ReuunlnK 1pnn11
24
25 \"
al••
boldy
R..: a rcula1tn11 �>loll
21 ·o
nn11
28 Plu,
Spe«-r
29
30 Dn v p ltnk
AN
StaiOr Rotor
31
Monafold
32
CGmmutatur
33 r1ni
34 Commulatctt
35
S.al
36
Waaher
37
38 End oov•r
ot 1 1 • w a
39 Cup
Paragraph
put shaft and install pin (18). P in must
be pressed mto shaft until end of pin is
about 0.8 mm (1 32 mchl below nush.
Place spacer !16) over spool and install
spool assembly mto valve body.
Position origmal shims (12) on thrust
washer (14), lubricate new seal ring ClO),
place seal ring in upper cover (9) and in·
stall upper cover assembly. Align the
match marks on cover nange and vulve
body and install cap screws finger tight.
Tighten a worm dnve type hose clamp
around cover nange and valve body to
align the outer dtameters, then tighten
cap screws to a torque of 24-30
{18-22 ft.-lbs.l.
If either Input shaft (17) or upper
cover (9) or both have been renewed, the NOTE:
following procedure for shimming must be
used. With upper cover Installed (with
original shims) as outlined above Invert unit
In a vise so Input shaft Is pointing
downward. Grasp Input shaft, pull downward
and prevent It from rotating. Engage drive
link (30) splines In valve spool and rotate
drive link until end of spool is flush with end
of valve body. Remove drive link and
alignment of drive link slot to tors on bar pin.
Install drive link until Its slot engages tor ·
sion bar pin. Check relationship of spool end
to body end. If end of spool Is within 0.0635
mm (0.0025 Inch) of being flush with end of
body, no additional shimming Is required.
If not within 0.0635 mm (0.0025 Inch) of be­
ing flush, remove cover and add or remove
shims (12) as necessary. Reinstall cover and
recheck spool to valve body position.
dnve lmk mstalled, place spacer
Wtth
plate (29) on valve body with plain side
up. Install stator-rotor set over drive link
splines and align cap screw holes. Make
certain vanes and vane springs
Fig. 28-With rotor positioned In stator at shown,
clearances (C) must not exceed 0.15 mm (0.006
Inch). Refer to text.
2 3
Cont.
·
N m
check
prop-
are
1 7