Specifications, Service and Repair of Farm and Lawn Tractors

________________________________________________________________________________

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.

 

________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________