Paragraph
23
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 (17) as a unit from bottom end
of housing. Remove Teflon
discs
(11), then
push pin (10) and centering springs
(9)
out of sleeve. Carefully 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 remove check valve seat (14)
using an Allen wrench. Remove check
ball (15) and spring (16).
Inspect centering springs
(9)
for cracks
or distortion and renew if necessary. In
spect spacer plates (20 and 23 ) and gear
set (21 ) for wear or scoring.
Parts
should
be
renewed if measurable wear exists. In
spect control spool and sleeve and hous
ing bore for nicks, scoring o r wear.
If
any
part is damaged, renew steering pump
assembly. Renew all
"0"
rings and seals.
When assembling the unit, tighten
check valve seat (14) to a torque of 17
N
·
m (150 in.-lbs.). Assemble spool in
sleeve making sure spool rotates
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.
24) 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
face 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
1
6
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 ),
spacer (20), gear set (21 ) and spacer (22)
onto valve body. Note that. spacer (22)
should
be
flush with outer surface of
gears if drive link is properly engaged
with control spool pin. Install end cover
(23) and tighten retaining cap screws
evenly to 17 N
·
m (150 in-lbs.) torque.
MF245 Standard Models
23. OVERH AUL. All MF245 models
except Orchard are equipped with the
hydrostatic hand pump shown exploded
in Fig. 27. The valve spool (22) and body
(25 ) are available only as a matched set.
To
disassemble the removed steering
control valve assembly, install a fitting
in one
of
the four ports in valve body (25),
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-
tion of arrow (A).
Fig. 24-Exploded view of
Char-Lynn Orbltrof hydro
static steering hand pump
used on MF235 and
MF245
Orchard models.
1
lnpu\oh•n
2.
Snap rtngo
3.
Snap nng
4.
Bearing
6.
Shnfl hou�1ng
6.
Quad
rtnw
1. ··o·· ""H
8.
Buoh•na
9
c�n�nng oprlng•
10. Pm
11
Tenon
d1oc
12
Plu11
13 "0
.
.
rtna
14
Ball-t
11>
ChMk valv•
ball
16
Spr1ng
17
ConlrOl llJIOOI
&
"'""'e
18
Voh·e houtmg
19
Onve
hnk
20
Sp&<l'r pia�
21 Gear eel
22.
Spoc:er
23.
End piau.
24.
Cop ocrew
MASSEY -FERGUSON
then clamp fitting in a vise
so
input
shaft (17) is pointing downward. Remove
cap
screws
(39) and end cover (38).
NOTE: Lapped
surfaces of end cover (38),
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),
commutator set (33 and
34)
and manifold
(32). Grasp spacer (29) and lift ofT the
spacer, drive link
(30)
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·
ward. Place a light mark on flange of
upper cover
(9)
and valve body (25) for aid
in reassembly. Unbolt. upper cover from
valve body, then
grasp
input shaft and
remove input shaft, upper cover and
valve spool assembly. Remove and
discard seal ring (10). Slide upper cover
assembly from input shaft and remove
Teflon spacer (16). Remove shims (12)
from cavity in upper cover or from face
of thrust washer (14) and note number
Fig. 25A-Schemetfc end view of steering control
sleeve
and spoof showing
correct
assembly of
centering springs (S) end drive pin (P).
Fig. 26-When properly as
s
embled
,
slot In end of
drive fink must align with valley of Inner gear as
shown to provfdo correct valve timing
.
