MASSEY FERGUSON MF230 Shop Manual page 15

23
Paragraph
spool {17-Fig. 24) and housing (18) are
available as a matched set only .
To
disassemble the removed unit, first
remove cap screws (24) and withdraw end
plate (23), gear set (21 ) , spacer (20) and
drive link (19) as a urut. Unbolt and
remove upper housing (5) and input shaft
(1) as a unit. Withdraw the control spool
and sleeve ( 1 7 ) as a unit from bottom end
of housing. Remove Teflon
push pin ( 1 0 ) and centering springs
out of sleeve. Caref ully slide spool
(splined end first) from sleeve <Fig . 25 ) .
Insert a bent wire through port in valve
body and push plug (12-Fig . 24) from
body, then r emove check valve seat (14)
using an Allen wrench. Remove check
ball ( 1 5 ) and spring (16).
Inspect centering springs
or distortion and rene w if necessary . In­
spect spacer plates (20 and 23 ) and gear
set (21 ) f or wear o r scoring .
be r enewed if measurable wear exists. In­
spect control spool and sleeve and hous­
ing bore f or nicks, scoring o r wea r .
part is damaged, renew steering pump
"0"
assembly. Renew all rings and seals.
When assembling the unit, tighten
check valve seat ( 1 4 ) to a torque of 17
N · m (150 in. -lbs.). Assemble spool in
sleeve making sure spool
smoothly in sleeve. Align spring slots in
spool and sleeve, then insert centering
springs (two sets of three each) so
arched center sections are together as
shown in Fig. 25A. Insert pin {10-Fig.
2 4 ) into spool and sleeve assembly and
install a Teflon disc (11) at each end
of pin.
Install assembled control spool unit.
from bottom of valve body using a
twisting motion. Do not allow sleeve to
move beyond flush with machined sur­
f ace of metering end of valve body.
Install upper housing ( 5 ) with input.
shaft ( 1 ) over splined end of spool and on­
to valve body. Tighten retaining cap
16
screws evenly to 25 N · m (220 m. -lbs. )
torque.
Be sure pin slot in drive shaft (Fig . 26)
is aligned with a valley of inner rotor to
ensure correct timing of control sleeve.
If drive slot is improperly aligned, steer­
ing unit will operate in reverse or "kick
back" when hydraulic pressure is ap­
plied. Assemble drive link (19-Fig. 24 ) ,
discs
(11), then
spacer (20), gea r set (21 ) and spacer (22)
(9)
onto valve body. Note that. spacer (22)
be
should
gears if drive link is properly engaged
with control spool pin. Install end cover
(23) and tighten reta ining cap screws
evenly to 17 N
MF245 Standard Models
(9) f or cracks
23. OVE RH A U L . All MF245 models
except Orchard are equipped wit h the
Parts
should
hyd rostatic hand pump shown exploded
in Fig. 27. The valve spool (22) and body
(25 ) are available only as a matched set.
If To
any disassemble the removed steering
control valve assembly, install a fitting
in one of the f ou r ports in valve body (25) ,
rotates
Fig. 25-V/ew of control spool end sleeve
assembly. Teflon discs (11) cover outer ends of
Internal pin. Withdraw spool from sleeve In direc-
flush with outer surface of
· m (150 in-lbs.) torque.
tion of arrow (A).
Fig. 24-Exploded view of
Char-Lynn Orbltrof hydro­
static steering hand pump
MF245
used on MF235 and
Orchard models.
1 lnpu\oh•n
Snap rtngo
2.
3. Snap nng
4.
Bearing
6. Shnfl hou�1ng
6. Quad rtnw
1. ··o·· ""H
8. Buoh•na
9 c�n�nng oprlng•
ball
10. Pm
Spr1ng
1 1 Tenon d1oc
12 Plu11
.
. rtna
13 "0
14 Ball-t
11> ChMk valv•
16
"'""'e
17 ConlrOl llJIOO I &
18 Voh·e houtmg
19 Onve hnk
Sp&<l'r pia�
20
21 Ge ar eel
22. Spoc:er
23. End piau.
24. Cop ocrew
MASSEY -FERGUSON
then clamp fitting in a vise
shaft (17) is pointing downward. Remove
cap screws (39) and end cover (38).
surfaces of end cover (38),
NOTE: Lapped
commutator set (33 and 34), manifold (32),
stator-rotor set (31), spacer (29) and valve
body (25) must be protected from scratch·
lng, burring or any other damage as seal-
Ing of these parts depends on their finish
and flatness.
Remove seal retainer (35) and seal
(36), then carefully remove washer (37),
34)
co mmutator set (33 and
(32). Grasp spacer (29) and lift ofT the
(30)
spacer, drive link and stator-rotor set
(31) as an assembly. Separate spacer and
drive link from stator-rotor set.
Remove unit from vise, then clamp fit­
ting in vise so input shaft is pointing up·
grasp
ward. Place a light mark on flange of
upper cover (9) and valve body (25) f or aid
in reassembly. Unbolt. upper cover from
valve body, then input shaft and
remove input shaft, upper cover and
valve spool assembly. Remove and
discard seal ring ( 1 0 ) . Slide upper cover
assembly from input shaft and remove
Teflon spacer ( 1 6 ) . Remove shims (12)
from cavity in upper cover or from f ace
of thrust washer (14) and note number
Fig. 25A-Schemetfc end view of steering control
sleeve
and spoof showing correc t assembly of
centering springs (S) end drive pin (P).
Fig. 26-When properly assembled,
drive fink must align with valley of Inner gear as
shown to provfdo correct valve
so input
and manifold
slot In end of
timing.