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Massey Ferguson 235, 245 - Multi-Power transmission
Transmission removal
MF 235, 245 tractors may be equipped with a Multi-Power transmission.
The Multi-Power transmission is a gear change transmission with six
forward speeds and two reverse speeds which is additionally equipped
with a hydraulically operated high-low range unit which may be shifted
while tractor is moving under load. Many of the service procedures and
some parts may be similar to six or eight speed transmissions; however,
refer to the following pages for service to Multi-Power transmission.
To remove the complete Multi-Power transmission unit from Massey
Ferguson 235, 245 tractor, first drain the transmission and hydraulic
system fluid and separate the engine from transmission housing. Remove
both step plates, disconnect clutch rod and both brake rods. Remove the
battery. Disconnect neutral starting switch, wiring to fender lights and
the Multi-Power shift control rod. Disconnect throttle linkage from
cross shaft, then unbolt and remove the battery support and air cleaner.
Attach hoist to transmission top cover, then unbolt and lift cover from
top of transmission case. Disconnect hydraulic line inside transmission
compartment. Unbolt the clutch pedal bracket, attach hoist. to
transmission and support differential housing. Unbolt transmission from
differential housing. Install guide studs and carefully slide
transmission forward away from differential housing. Rejoin transmission
to differential housing completely before tightening the retaining
screws. It may be necessary to reach through opening for the response
control cover and turn the pto coupling before transmission will slide
up to differential housing. Tighten the screws attaching differential
housing to transmission housing to 75 Nm (55 ft-lbs.) torque. Be sure
hydraulic line in transmission is reconnected. Transmission should be in
neutral before installing shift cover. Make sure shift levers engage
shift rails. Tighten cover retaining screws to 47 Nm (35 ft.-lbs.)
torque.
Shift linkage
Multi-Power shift control valve spool must move fully to high and low
positions as hand control lever is moved to top and bottom of slot in
instrument panel. To adjust linkage, move hand control lever towards
"HIGH" position until front of lever is within 1.6 mm (1/16 inch) from
top edge of quadrant slot. Loosen clamp bolt securing link to lower rod,
then push lower rod downward as far as it will go. Retighten clamping
bolt to lock the adjustment.
Shift control valve
Remove and reinstall - To remove the Multi-Power control valve, first
detach Massey Ferguson 235, 245 engine from transmission housing. Remove
clutch release bearing, release fork and pivot shafts. Disconnect
Multi-Power shift linkage and oil inlet tube. Unbolt and remove shift
lever bracket and linkage assembly. Remove retaining cap screws, then
withdraw shaft retainer, pto input shaft and valve housing as a unit
from transmission housing. NOTE: The clutch unit prevents removal of
transmission shaft until transmission is disassembled. When detaching
control valve from retainer, note that left, front mounting screw is
sealed with a copper washer. Make sure this washer is reinstalled in the
correct location when unit is reassembled. Use a new gasket when
reinstalling valve. Make sure the long cap screw with copper sealing
washer is installed in the correct hole and tighten all screws evenly to
a torque of 4.1-5.4 Nm (36-48 in.-lbs.). Tighten the four screws that
attach housing to transmission to 54-61 Nm (40-45 ft-lbs.) torque.
Overhaul - To overhaul the removed Multi-Power control valve and proceed
as follows: Remove fitting and detent assembly, then withdraw shift
valve. Remove plug, washer and spring, then bump valve body against a
wooden block, if necessary, to dislodge regulating valve from its bore.
Clean all parts in a suitable solvent. Discard O-rings when
reassembling. Carefully examine all parts for wear, scoring or other
damage. All parts are available individually. When reassembling the
valve unit, make sure regulating valve spool is installed "V'' notched
end first. Tighten plug to a torque of 23-30 Nm (17-22 ft.-lbs.). Shift
valve must be inserted before fitting is installed.
Transmission top cover
Remove the transmission top cover, first remove hood and battery.
Disconnect drag links and power steering hoses if so equipped. Unbolt
and remove the battery support and the air cleaner. Disconnect
interfering control rods, cables, wires and tubes, then unbolt the cover
from top of transmission. Notice that two screws are located at front
edge of top cover. Install guide studs, attach hoist and carefully raise
top cover. When reinstalling, place all gears in neutral and be sure
detent pins and springs are correctly positioned under gasket. Lower
cover into position over the guide studs making sure levers engage shifl
rails. Tighten cover screws to 47 Nm (35 ft.-lbs.) torque.
Shifter rails and forks
To remove the shifter rails and forks, first remove transmission top
cover and detach transmission from differential housing. It is not
necessary to separate transmission from MF 235, 245 engine. Unwire and
remove the set screws retaining selector and shifter forks to rails.
Remove detent spring and plunger assemblies and stop plate, then
withdraw shifter rails and forks from transmission case. Forks are
interchangeable, but rails are not. Rails should be installed with
milled flat to top rear and selector lock grooves to center. Interlock
pin prevents the movement of the other rail when either selector rail is
moved from the neutral position. When assembling, slide center shift
rail into case and through the selector and shift fork. Tighten selector
set screw and install safety wire. Rotate rail until shift fork set
screw can be tightened fully, then install safety wire. Install the left
shift rail and fork, then right shift rail and fork into respective
bores, tighten set screws and install safety wire. Slide the planetary
shift rail through rear of case and locate fork over end with set screw
to the outside. Slide rail forward into case and into selector. Tighten
set screws and install safety wire. Be sure that interlocking pin is
through the center rail and that all rails are in "NEUTRAL." Install
steel balls in lock mechanism and locate at rear of case. The steel
balls should be at both ends of the center rail interlock pin and the
widest flat of lockplate should be over planetary rail. Tighten screws
attaching the interlock mechanism to 47 Nm (35 ft.-lbs.) torque. Locate
the planetary shift fork into groove of planetary coupler, then slide
coupler into planetary while piloting shift fork over the rail. Tighten
set screws and safety wire in place.
Planetary unit and mainshaft
Planetary unit - To remove the planetary unit, first detach transmission
from differential housing. Remove the planetary shift fork and coupling
from rear of Massey Ferguson 235, 245 transmission case. Remove the four
retaining screws and withdraw rear cover, rear thrust washer and planet
carrier. Work planetary ring gear and dowels from case using
screwdrivers. Remove planetary front cover and shim. Planet pinion
shafts are a tight press fit in planet carrier. Use a suitable press for
removing and installing pinion shafts. Assemble and install unit as
follows: Apply a light coat of grease lo one side of thrust washers,
bearing needles and spacer washers. Position one thrust washer on bench
with greased side up and locate pinion over the washer. Install one
spacer in pinion, followed by one row of needles, a spacerl, the second
row of needles and the third spacer and thrust washer. Assemble the two
remaining pinions in the same way. Position the carrier in a press with
the hub side down, install the pinion with bearings and washers, then
press pinion shaft into carrier until flush. Position front, plate on
ring gear with oil grooves toward inside. Install shim with slots on
shim and front plate aligned and toward top when assembled to rear of
case. Tap into position on rear case to be sure dowels are fully into
case. Use a light coat of grease to hold thrust washer to the front of
carrier making sure tangs on washer engage notches of carrier. Insert
carrier assembly into ring gear carefully so thrust washer doesn't fail.
Make sure carrier is fully into ring gear and over main shaft. Install
the remaining thrust washer making sure tangs engage notches of carrier.
Install rear cover plate with oil grooves inward. The notched lower
section (N) of cover plate should be over the bottom right-hand mounting
bolt hole. Install the bottom left-hand mounting bolt without
lockwasher. Install the three remaining bolts with lockwashers, then
torque all four mounting bolts to 41-47 Nm (30-35 ft.-lbs.). Complete
assembly by reversing removal procedure.
Mainshaft - Remove mainshaft and sliding gears, first remove planetary
unit and shifter rails and forks. Move low speed sliding gear forward
until groove in mainshaft splines is exposed. Insert a large blade
screwdriver into the groove to hold gear in position, then insert a pry
bar between front of gear and transmission housing wall. Pry shaft
rearward until front bearing is free from housing bore. Remove snap
ring, then pull mainshafl rearward to bump bearing from front of shaft.
Remove gears as shaft is withdrawn rearward. Note thal rear bearing is
removed and installed over front end of mainshaft. When reinstalling, be
sure that cluster gear is positioned with smaller gear facing forward
and that first-reverse gear is positioned with shift fork groove towards
the rear. Insert a spacer between front bearing and wall of transmission
case, then tap rear of mainshaft with a soft hammer until bearing is
seated against shoulder of shaft. Complete installation by reversing the
removal procedure.
PTO input shaft and retainer
To remove pto input shaft and retainer, first separate transmission from
MF 235, 245 engine. Remove clutch throwout bearing, release fork and
shafts from front of transmission housing. Disconnect Multi-Power
control linkage and hydraulic line. Remove retainer housing cap screws,
then withdraw retainer with input shaft as a unit from transmission
case. Remove large snap ring at rear of retainer, then bump shaft and
bearing rearward from retainer. Inspect all parts for wear or damage and
renew if necessary. Oil seals are installed with lips facing rearward.
Be sure shield side of bearing is towards gear end of input shaft.
Lubricate all parts with transmission oil prior to assembly. Use
suitable seal protector sleeves over splined end of input shafts to
avoid damaging oil seals during reassembly. Apply nonhardening sealer to
threads of retainer housing cap screws, lhen tighten to 60 Nm (45
ft.lbs.) torque.
Transmission input shaft and Multi-Power clutch
Remove, reinstall and overhaul - Remove transmission input shaft and
Multi-Power clutch, first remove transmission from Massey Ferguson 235,
245 tractor. Remove pto input shaft and retainer housing and remove
mainshaft. Move transmission input shaft forward slightly and remove
spacer plate. Withdraw input shaft rearward from transmission case while
sliding clutch assembly and overdrive pinion off the shaft. Inspect
needle bearing, sealing rings and input shaft for wear or damage and
renew if necessary. To disassemble the removed Multi-Power clutch unit,
place clutch assembly on a clean bench with overdrive pinion up. Push
down on clutch retainer plate to compress return springs, then remove
snap ring with a narrow blade screwdriver. Remove all components from
clutch housing and examine for wear, scoring or other damage. Renew
clutch sealing rings whenever clutch is disassembled. Renew any
components that show signs of wear, damage, distortion or overheating.
Thickness of friction discs when new is 2.41-2.59 mm (0.095-0.102 inch).
Thickness of driving plates when new is 1.67-1.75 mm (0.660-0.690 inch).
Friction discs and drive plates must be renewed as a complete set. When
reinstalling piston, carefully compress outer seal ring using a feeler
gage blade or similar tool while working piston into clutch housing.
When assembling clutch plates, note that clutch housing contains six
bleed holes that are evenly spaced around the housing and that drive
plates have six external lugs. Install first drive plate on lop
ofpist.on with lugs located one spline to the right (clockwise) from
bleed holes. Place the six piston return springs on the lugs of the
first drive plate. Install friction discs and remaining two drive plates
alternately, staggering the lugs of each plate one spline further to the
right of the plate previously installed. Make certain that return
springs contact only the first plate, then install retainer and snap
ring. To reinstall clutch unit and input shaft, reverse the removal
procedure.
Countershaft and reverse idler gear
Countershaft - Remove countershaft, first remove transmission assembly.
Remove mainshaft and gears, transmission input shaft and pto lower shaft
and drive gear. Remove snap ring from rear of countershaft, then tap
shaft forward until free from rear bearing. Unseal snap ring from groove
of countershaft and move it forward onto unsplined area of shaft. Use a
suitable clamp around overdrive gear and direct drive gear to compress
coupler spring. Remove snap ring, then move shaft rearward to allow
removal of overdrive gear and direct drive gear from shaft. Countershaft
can now be withdraw forward from transmission case and gears lifted out
of top opening. To reinstall, reverse the removal procedure.
Reverse idler gear - The reverse idler shaft and gear assembly can be
removed from transmission housing after removing the mainsbaft and
gears. The idler gear shaft is retained in the housing by a clip at rear
of shaft. The cluster gear contains two rows of loose needle rollers (28
each row) which use the shaft and gear as inner and outer races. Removal
and installation will be facilitated by using a dummy shaft 25 mm (1
inch) in diameter and 55 mm (2-3/16 inch) long to retain loose needle
rollers inside the gear during removal and installation. Remove
retaining clip and push dummy shaft into the gear from the front
displacing the idler shaft rearward. Lift out gear assembly with dummy
shaft. Reinstall, reverse the disassembly procedure. Use petroleum jelly
along with the dummy shaft to hold needle rollers in place in gear
cluster.
To remove pto lower shaft, first remove MF 235, 245 transmission
assembly. Remove clutch throwout bearing, fork and shaft and the brake
pedal cross shaft from front of pto shaft. Thread two cap screws into
tapped holes in bearing retainer and tighten evenly to force retainer
with bearing off front of shaft. Withdraw pto shaft rearward from
transmission housing. Pto drive gear can be removed from housing after
removing mainshaft and transmission input shaft. To reinstall, reverse
the removal procedure. Front end of pto shaft contains a threaded hole
that can be used to pull shaft into front bearing. Apply nonhardening
sealer to threads of retainer and cover mounting cap screws, then
tighten to 60 Nm (45 ft.-lbs) torque.
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