________________________________________________________________________________

Massey Ferguson 230, 240, 245, 250 - Manual shuttle

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

Shifter rails and forks

Remove the shifter rails and forks, first remove Massey Ferguson 230, 240, 245, 250 transmission top cover and detach transmission from differential housing. It is not necessary to remove transmission housing from engine. Carefully remove detent springs and plungers. Remove safety wire and loosen all set screws from shift forks and planetary selector. Remove the planetary shift fork, then unbolt and remove the shift rail lock from rear of transmission. Pull the shuttle and planetary shift rail out rear of transmission and withdraw planetary selector and the shuttle fork from top. Slide the remaining two shift rails out of shift. forks. Observe the following when reassembling. Position the three transmission shift forks into gears as shown in pic. It may be necessary to move the shuttle coupling forward so that fork may be inserted into groove. The shift forks are not interchangeable. The left (2nd and 3rd gear) shift fork should have lug, set screw and shift notch all toward front. The notch and set screw will be toward front but lug will be toward rear of correctly installed right (1st gear) shift fork. Slide shift rails into forks. Shift ralls are not interchangeable. The two short ralls should have notches for shift rail lock facing toward the interlock pin and flats toward top. Be sure set screws engage detent in shift rail, tighten screws and safety wire all set screws. Install the shift rail lock with interlock pin. Spacer should be on longer screw at left as shown. Tighten both screws to 41-47 Nm (30-35 ft-lbs.) torque.

Planetary unit

To remove planetary unit it is necessary to remove transmission top cover and separate transmission from differential housing. lt is not necessary to detach Massey Ferguson 230, 240, 245, 250 transmission from engine. Remove planetary shift fork and coupling from rear of planetary. Remove the four retaining cap screws then withdraw rear cover plate, thrust washer and planet carrier. Pry rang gear and dowels from transmission case. Remove front cover and shim. Planet pinion shafts are a tight press fit in planet carrier. Use a suitable press to remove and install pinion shafts. Reinstall planetary unit, reverse the removal procedure while noting the following special instructions: Install shim and front plate with slots aligned and pointing upward. Be sure tangs on thrust washers engage slots in carrier. Position rear plate with cutaway section at lower left-hand corner of ring gear. Tighten retaining cap screws evenly to 47 Nm (35 ft-lbs.) torque.

PTO input shaft and retainer

To remove pto input shaft and retainer, first separate transmission from MF 230, 240, 245, 250 engine. Remove brake cross shaft, clutch release bearing, release lever and shafts from transmission housing. Check transmission input shaft end play before removing pto Input shaft. If end play exceeds 0.50 mm (0.020 Inch), a new thrust washer must be installed during reassembly to provide recommended end play of 0.25-0.50 mm (0.010-0.020 Inch). Unbolt retainer from front of transmission housing, then withdraw pto shaft and retamer while holding transmission input shaft in place in housing. To disassemble the removed unit, unseat and remove large snap ring retaining bearing in retainer housing. Bump shaft and bearing rearward out of housing. Bearing can be removed from shaft after removing smaller snap ring. Inspect seals and bearings and renew if necessary. When installing needle bearings always press against lettered side of bearing. Seals should be installed with lip facing rearward. Be sure shielded side of bearing is towards input shaft gear teeth. It is recommended that seal protector sleeves be placed over splined ends of transmission and pto shafts to avoid damaging oil seals during reassembly. If transmission input shaft end play was excessive (checked prior to disassembly), select a thrust washer of correct thickness to provide recommended end play and install over input shaft. If end play was not checked prior to disassembly pto input shaft and retainer should be installed with original shim and end play checked with a dial indicator. If end play is excessive, remove pto input shaft and retainer and install proper thickness thrust washer. Specified shaft end play is 0.25-0.50 mm (0.010-0.020 inch). When installing retainer and input shaft, coat threads of mounting cap screws with a nonhardening sealer. Tighten cap screws to 60 Nm (145 ft-lbs.) torque.

Transmission input shaft and forward-reverse gear cluster

Remove transmission input shaft, first remove transmission assembly from Massey Ferguson 230, 240, 245, 250 tractor. Remove shifter rails and forks. Remove brake cross shaft and clutch release bearing and fork from front of transmission housing. Move pto lower shaft rearward to permit pto constant mesh gear to drop to bottom of transmission case as follows: Remove cover from front of housing, then remove snap ring from front of pto shafl. Thread two cap screws into tapped holes in bearing retainer and tighten evenly to pull retainer with bearing from pto shafl. Pull pto shaft rearward until constant mesh gear drops to bottom of case to provide clearance for input shaft removal. Prior to removal of pto Input shaft, measure transmission input shaft end play using a dial indicator, or measure clearance between reverse gear and thrust washer using a feeler gage. Record the measurement for use in reassembly. Specified end play is 0.25-0.50 mm (0.010-0.020 Inch). Remove beanng retainer mounting cap screws, then withdraw retainer with pto input shaft while holding transmission input shaft and forward-reverse gear cluster in place in transmission case. Carefully move input shaft and gear cluster forward to disengage input shaft from mainshaft. Note that 23 loose needle bearings are contained in rear of input shaft and they may fall out when shaft is removed.

Move rear of input shaft with gear cluster upward and rearward out top of transmtssion case. The forward-reverse gear cluster contains 240 loose needle rollers. Be sure to keep gear cluster in position on input shaft during removal from housing to avoid dropping rollers Into transmission housing. Slide reverse gear and forward gears with needle rollers and spacer washers off input shaft. Remove shift collar, springs and detents from shaft. Remove spacers and needle rollers from input shaft bore if necessary. Reassemble, reverse the disassembly procedure while noting the following special instrucllons: Be sure to account for all the needle rollers in forward and reverse gears (two rows of 60 rollers in each gear) and rollers in input shaft (one row of 23 rollers). Use petroleum Jelly to hold rollers and spacers in position. If transmission input shaft end play (measured prior to disassembly) was not within specified range of 0.25-0.50 mm (0.010-0.020 inch), select thrust washer of correct thick ness to provide recommended clearance. Only one thrust washer must be installed. If end play was not checked prior to disassembly, it will be necessary to reinstall main input shaft with original thrust washer, pto input shaft and retainer housing. Check input shaft end play using a dial indicator, or measure clearance between reverse gear and thrust washer using a feeler gage. Then, if necessary, disassemble input shaft and install correct thickness thrust washer to obtain specified end clearance. It is recommended that a suitable seal protector sleeve installed over splined end of transmission input shaft to avoid damaging oil seal when assembling pto input shaft over the transmission shaft. Apply suitable nonhardening sealer to threads of bearing retainer cap screws, then tighten to 60 Nm (45 ft-lbs.) torque.

Reverse idler assembly

Remove reverse idler gear 4, first remove pto input shaft and transmission input shaft. Remove oil trough from front of main shaft. The right-hand clutch release fork shaft can be used as a dummy shaft to remove and install idler gear and shaft. A dummy shaft can also be made from hard plastic, wood or steel bar stock 25 mm (1 inch) in diameter and 100 mm (4 inches) long. Insert dummy shaft into idler gear from the rear and push idler shaft out of gear and housing. Remove idler gear assembly being careful not to drop needle rollers. There is a total of 46 needle rollers (23 per path) contained in idler gear. When reassembling, use petroleum jelly and a dummy shaft to hold components in place. Position idler gear in housing with larger gear forward. Slide idler shaft into housing and gear making sure that roll pin in end of shaft and oil hole in shaft are positioned upward. Note that idler shaft on some models may have a notched section on front of shaft that aligns with input shaft housing instead of roll pin.

Mainshaft and sliding gears

Remove mainshaft, first remove MF 230, 240, 245, 250 transmission. Remove shifter rails and forks, rear planetary and transmission input shaft. Tap mainshaft rearward to force front bearing from shaft. Continue to slide shaft out the rear while removing gears. Note that rear bearing must be removed and installed over forward end of shaft. To reinstall shaft, reverse the removal procedure. Be sure that large external snap ring on rear bearing is towards rear of shaft and that sliding gears are positioned with shift fork grooves facing each other.

PTO lower shaft and drive gear

Remove pto lower shaft and drive gear, transmission must first be removed. Remove brake cross shaft and clutch release linkage and throwout bearing from front of transmission housing. Remove front cover plate, and remove snap ring from front of pto shaft. Thread two cap screws into tapped holes of bearing retainer and tighten evenly to force retainer with bearing from the shaft. Withdraw pto shaft rearward from housing. Remove pto input shaft and transmission input shaft. Remove pto drive gear out top opening of housing. Reinstall, reverse the disassembly procedure while noting the following special instructions: Be sure that hub side of pto gear faces forward. Front end of pto shaft contains a threaded hole which can be used to pull shaft into front bearing. Apply nonhardening sealer to threads of retainer cover cap screws, then tighten to 60 Nm (45 ft.-lbs.) torque.

Countershaft

To remove countershaft and gears, remove input shafts and retainer and remove mainshaft and gears. Withdraw pto lower shaft from housing and remove drive gear. Remove snap ring from front of countershaft and remove constant mesh gear out top of transmission housing. Remove snap ring from rear of shaft, then tap shaft forward until free from rear bearing. Slide countershaft forward from housing while removing gears out top of housing. Reinstall, reverse the removal pro cedure. Position gear with beveled edge of teeth and hub facing rearward, position middle gear with beveled edge of teeth and hub facing forward and install rear gear with beveled edge of teeth and hub facing rearward.