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Massey Ferguson 230, 235, 245 - Six-speed transmission

MF 230, 235, 240, 245, 250 Tractors Repair Operations

Transmission removal

MF 230, 235, 245 tractors may be equipped with three-speed sliding gear set compounded by a dual range planetary reduction gear set which provides six forward speeds and two reverse speeds.

Remove the complete 6-speed transmission unit from the tractor, first drain transmission and hydraulic system fluid and separate engine with fuel tank from transmission. Remove battery support with air cleaner from Massey Ferguson 230, 235, 245 tractor. Remove cap screws attaching shift cover to top of transmission. Attach a suitable hoist to steering support, then lift steering column, instrument panel and shift cover from transmission. Remove both step plates, disconnect clutch pedal rod and both brake rods, then unbolt clutch pedal bracket. Attach hoist to transmission and support differential housing, then unbolt transmission from differential housing. Install guide studs and carefully slide transmission forward away from differential housing. Rejoin transmission to differential housing completely before installing the attaching screws. It may be necessary to reach through response control opening to turn pto coupling before transmission will slide up to differential housing. Tighten the screws attaching differential housing to transmission housmg to 68-75 Nm (50-55 ft-lbs.) torque. When reinstalling shift cover, place all gears in neutral and be sure detent pins and springs are correctly positioned under gasket. Lower cover into position over guide studs making sure levers engage shift rails. Tighten cover screws to 47 Nm (35 ft-lbs) torque. Reconnect transmission to engine.

Shifter raiIs and forks

To remove shifter raiIs and forks, first remove transmission top cover and detach transmission housing from differential housing. Remove detent springs and plungers from top of housing. Remove shift rail interlock plate from rear of housing. Remove set screws retaining shift forks to rails, then withdraw shift rails and forks from transmission case. When reinstalling, be sure planetary selector is positioned with fork upward and set screw hole towards outside of case. Shift forks are interchangeable, but shift rails are not. Be sure shift rails are positioned so milled flat area of each shaft is at the rear and facing upward and the notch in rear end of each shaft for interlock pin is facing inward. Tighten set screws securely and lockwire in place.

Planetary unit

The planetary unit can be removed after separating MF 230, 235, 245 transmission case from differential housing. Remove planetary shift fork and coupler. Remove cap screws retaining planetary rear cover and ring gear to transmission case. Withdraw planetary carrier assembly from ring gear, then use two screwdrivers to pry ring gear and dowels from case. Planet pinion shafts are a tight press fit in planet carrier; use a suitable press when removing and installing. Two rows loose needle rollers are used in each planet pinion, separated and spaced by three washers. Use viscous grease to stick thrust washers to gears, and completely assemble the bearing, before attempting to install the pinion shafts. Be sure shim and front plate are positioned with cutaway slot towards top of planetary. Oil groove side of front and rear plates should face inward. Use light coating of grease to hold thrust washers in position. Cutaway section of rear plate should be on bottom right-hand corner. Cap screw should be installed without lockwasher. Tighten retaining cap screws to 41-47 Nm (30-35 ft-lbs.) torque.

Input shafts

Remove input shafts, it is first necessary to remove transmjssion from Massey Ferguson 230, 235, 245 tractor. Remove brake cross shaft and clutch release bearing and fork. It is also necessary to move pto lower shaft rearward to allow pta gear to drop down into case to provide clearance for removal of input shafts and retainers as an assembly; proceed as follows: Remove cover plate at front of pto shaft. Remove snap ring from shaft, then thread two cap screws into tapped holes in bearing housing to force housing and bearing from shaft. Pull pto shaft rearward until pto gear drops to bottom of case. Remove cap screws attaching input shaft retainer to case, then withdraw input shafts and retainer as an assembly. To disassemble, remove snap ring and bump transmission input shaft and bearing rearward from retainer. Note that Loctite adhesive is used on outer diameter of bearing to aid in retaining it in housing. Heating housing at bearing area will make removal easier. Remove snap ring, then bump pto input shaft with bearings from housing. When reassembling, be sure to renew oil seals. Lips of seals must face rearward. Apply a suitable sealant to outer diameter of seals. Lubricate seal lips with grease prior to installation of input shafts. When renewing bearings, note that "open" side of bearings must face away from gear teeth. Use a suitable seal protector sleeve over spli ned end of pto input shaft and transmission input shaft to avoid damaging oil seals as input shafts are installed. Apply Loctite 271 adhesive to outer diameter of transmission shaft bearing. Reinstall bearing retainer with shafts making certain cutout section of housing for pto drive gear is towards bottom of case. Apply a suitable non hardening sealer to threads of mounting cap screws, then tighten to 54-61 Nm (40-45 ft-lbs) torque. Reinstall pto lower shaft.

Reverse idler assembly

The reverse idler gear and shaft can be removed after removing the mainshaft. Reverse idler shaft is retained by a clip that fits into a notch in rear end of shaft. Push shaft rearward from housing and remove idler gear being careful not to lose the loose bearing rollers. A total of 56 bearing rollers are contained in bore of gear. Use a light coating of grease to hold bearing rollers and washers in place in gear during reassembly. A dummy shaft, slightly smaller in diameter than idler shaft, can also be used to hold rollers and washers in correct position. Dummy shaft must be short enough that it can be pushed out of front support boss and removed from housing as idler shaft is pushed into the gear from the rear. Be sure gear cluster is positioned in transmission with smaller gear teeth forward.

PTO lower shaft and gears

Remove pto lower shaft and gears, first remove MF 230, 235, 245 transmission assembly. Remove brake cross shaft, clutch release bearing and fork, and shift rails and forks. Remove front cover plate. Remove snap ring from front of pto shaft, then thread two cap screws into tapped holes in bearing retainer to force retainer and bearing off the shaft. Pull shaft rearward out of the countershaft. Unbolt and remove input shafts and retainer as a unit from housing. Lift pto gear from transmission case. When reassembling, be sure bub side of pto gear faces forward (away from countershaft). Install input shafts and retainer making certain cutout section of retainer faces downward. Apply nonbardening sealer to threads of retainer cap screws, then tighten to 54-61 Nm (40-45 ft.-lbs.) torque. Insert pto shaft through countershaft and pto gear. Install bearing retainer with bearing over shaft. Use a suitable spacer tube, washer and bolt threaded into front end of shaft to pull pto shaft into the front bearing until washer and snap ring can be installed at front of shaft. Install front cover, apply nonhardening sealer to threads of retaining cap screws and tighten to 54-61 Nm (40-45 ft.lbs.) torque.

Countershaft

Remove countershaft and gears, transmission must first be removed. Remove shift rails and forks, planetary unit, pto lower shaft and gear, input shafts and retainer, and mainshaft. Remove snap ring from front of countershaft and slide front gear off the shaft. Remove snap ring from rear of shaft, then use a block of wood and hammer to drive countershaft forward until free from rear bearing. Withdraw countershaft forward from housing and remove gears. Renew parts as necessary. Be sure to install front bearing with "open" side facing away from gear teeth on countershaft. Install needle bearing flush with end of shaft. Install gears with hub sides facing together. Insert countershaft into housing from the front. Block front of shaft, then tap rear bearing onto shaft until snap ring can be installed. Install constant mesh gear and snap ring onto front of countershaft.