Specifications, Service and Repair of Farm and Lawn Tractors

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Massey Ferguson 230, 235, 240, 245, 250 - Brakes and PTO


Brakes

Massey Ferguson 250 and Orchard model tractors, which have planetary type final drive units in outer ends of rear axle housing, are equipped with disc type brakes. The disc brakes operate in a dry compartment within the axle housings on some models, while other models are equipped with wet type brakes. All other models are equipped with internal expanding shoe type brakes located at the axle wheel ends.

Shoe-type brakes adjustment - Raise and block rear of MF 250 tractor so rear wheels are off the ground. Remove adjustmg cover and, using a screwdriver or adjusting tool, turn star wheels until shoes contact brake drum. Back off star wheels an equal amount until drums are free and brake pedal free travel is 25 mm (1 inch) measured at pedal pad. Latch brake pedals together, then check for uneven brake application. If necessary, loosen brake adjuster on side that is tight until brakes apply evenly. Overhaul - The brake drum can be removed after removing the rear wheel and the two drum retaining screws. Remove shoe retaining pins and springs, anchor springs and brace. Lift off shoes with adjuster and spring. Remove brake camshaft, disconnect brake rod and loosen set screw in brake lever. Withdraw camshaft from brake lever and backing plate. To reassemble, reverse the disassembly procedure. Adjust brake rod length so camshaft contacts, but does not move brake shoes with pedal fully up against its stop. Adjust brake shoes.

Disc-type brakes adjustment - To adjust disc brakes, first make sure both brake rods are adjusted to equal lengths. Raise and support rear of Massey Ferguson 250 tractor so rear wheels are off the ground. Turn brake adjustmg nut at each brake lever until brake pedal free play is 63.5 mm (2-1/2 inches) measured at pedal pad. Latch brake pedals together and road test to check for uneven brake application. If brakes pull to one side, equalize braking action by turning brake lever adjusting nut counterclockwise on side that pulls.

Overhaul - Remove disc brake assemblies, first remove complete axle housing assembly. Remove brake actuator assembly from left-hand side, and remove actuator assembly with differential lock mechanism from right-hand side. Remove retaining screws and withdraw differential carrier plate. Remove brake components from axle housing keeping parts in order to ensure correct reassembly. If brake parts and compartment are coated with oil on models equipped with dry brakes, make certain that necessary oil seals are renewed before reassembling brakes. Unhook springs and examine actuator unit and balls for wear or pitting. Groove depth in wet type friction discs is approximately 0.3 mm (0.012 inch) when new. Friction discs should be renewed when worn to the point that grooves begin to disappear. The intermediate plates should be renewed whenever friction discs are renewed. To reassemble brakes, reverse the removal procedure while noting the following special instructions: On wet type brakes, dip friction discs, intermediate plates and actuator unit in clean transmission oil prior to reassembly. Two friction discs and one separator plate are installed on planetary side of brake actuator unit and remaining discs and plates are installed on differential side of actuator. Be sure that lip of rubber boot is seated correctly in groove of actuator rod and that garter spring is in proper position. Adjust brakes.

Power take-off (live)

Output shaft - To remove pto output shaft, first drain oil from differential housing. Remove pto shield and retainer plate from rear of housing. Withdraw shaft, rear bearing and seal housing as an assembly. Oil seal and rear bearing can be renewed at this time. Output shaft front needle bearing can be renewed after first removing differential assembly. Remove bearing rearward, then use appropriate size step plate and driver to install new bearing flush to slightly below rear face of housing bore. To reinstall output shaft, reverse the removal procedure. Be sure to lubricate oil seal and O-ring during assembly.

Ground speed gears - Remove ground speed drive gear, driven gear and bushing, first remove pto output shaft. Remove hydraulic lift cover, remove hydraulic pump. Remove retaining snap ring and slide drive gear off bevel pinion shaft. Remove pto shift cover, then slide driven gear forward out of bushing. To renew driven gear bushing, remove differential assembly. Drive bushing forward from housing bore. Install new bushing so front face of bushing is flush with inner end of chamfer in housing bore. Reinstall gears, reverse the removal procedure.

PTO main drive gears - The pto main drive gears and clutch are included in Massey Ferguson 230, 235, 240, 245 transmission drive train. Refer to appropriate transmission and clutch sections for removal and overhaul.

Independent power take-off

Operation - MF 230, 235, 240, 245 tractors may be equipped with an independent pto which is driven by a flywheel mounted "Split torque" clutch and controlled by a hydraulically actuated multiple disc clutch contained in differential housing. The pto front drive shaft is splined into hub of the "Split torque" clutch cover and turns continuously when engine is running. The pto control lever is mounted on left-hand side of cover of differential housing. Moving lever forward disengages the hydraulically actuated multiple disc clutch and engages the pto brake. Moving lever rearward releases the hydraulic brake and engages the multiple disc pto clutch. Hydraulic pressure to actuate the pto clutch and brake is produced by the auxiliary gear type pump which also provides power for the Multi-Power clutch and/or auxiliary hydraulic system if tractor is so equipped.

Output shaft

Remove and reinstall - Remove output shaft, first drain oil from differential housing. Remove shield and retainer plate from rear of housing. Withdraw shaft, rear bearing and seal assembly rearward from housing. Inspect all parts and renew as necessary. Renewal of front needle bearing requires splitting tractor and removing pto clutch assembly. Reinstall, reverse the removal procedure. Lubricate oil seal lip and O-ring before installing.

PTO clutch unit

Remove and reinstall - Remove the pto clutch and valve assembly, first split Massey Ferguson 230, 235, 240, 245 tractor between transmission housing and differential housing and remove hydraulic pump assembly. Withdraw clutch unit from differential housing. Reinstall by reversing the removal procedure.

Overhaul - Disassemble the 4 removed clutch and valve unit, proceed as follows: Remove snap ring and thrust washer, then withdraw control valve housing with brake cylinder from clutch housing. Brake disc is retained to clutch housing by two pins. Unbolt and remove brake cylinder, piston and wear plate from valve housing. Remove snap rmg, retainer plate, friction plates, wave springs and drive plates. Lift out drive hub. Remove piston and seal rings. Withdraw control valve spool assembly from housing. Unseat internal snap ring to separate valve spool from plunger. Note that spacer ball is available in different diameters and is used to establish collapsed length of control valve assembly. Recommended valve length is 102.36-103.12 mm (4.030-4.060 inches). Renew clutch plates and discs if they are excessively worn, distorted or show signs of overheating. Measure free height of wave springs with springs laying on a nat surface. All springs should be the same height within 0.5 mm (0.020 inch). New friction discs should be soaked In clean transmission/hydraulic oil for 30 minutes before Installation. To reassemble, install piston with new seal rings into housing. As an aid in installing piston, three or four pieces of 4 mm (3/16 inch) diameter rod can be inserted into clutch housing to serve as alignment guides for piston. Place drive hub in housing, then alternately install drive plates, wave springs and friction discs making sure that a drive plate is installed first against piston. Push down on clutch pack to compress wave springs, then insert two small diameter pins into clutch housing oil boles to hold clutch pack partially compressed. Install retaining plate and snap ring, then remove the assembly pins from clutch housing oil holes. Install seal rings on clutch housing and lubricate with hydraulic oil. Install valve housing, thrust washer and snap ring. Assemble brake piston, spring and cylinder. Position wear plate under brake disc, then install brake cylinder assembly using a new O-ring.

Pressure testing - Power for the independent pto clutch and brake is supplied by the gear type auxiliary pump which also supplies the Multi-Power transmission clutch and/or auxiliary hydraulic system if so equipped. To check pto clutch pressure, first operate tractor until hydraulic oil temperature is 50-60C (120-140F). Remove pressure test port plug from pto shift cover and install a 4000 kPa (600 psi) pressure gage in test port. Start engine and run at 1800 rpm, then move control lever to engaged (rear) position. Pressure gage reading should be 1900-2240 kPa (275-325 psi). Move pto shift lever to disengaged position. Pressure should drop to zero and pto shaft should stop rotating in about five seconds. If pressure or pto operation is not as specified, remove and overhaul pto control valve unit.

 

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