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Service ManualMF750 & MF760

CombineVolume 1 of 2

THIS IS A MANUAL PRODUCED BY JENSALES INC. WITHOUT THE AUTHORIZATION OF MASSEY HARRIS MASSEY FERGUSON OR IT’S SUCCESSORS. MASSEY HARRIS MASSEY FERGUSON AND IT’S SUCCESSORS

ARE NOT RESPONSIBLE FOR THE QUALITY OR ACCURACY OF THIS MANUAL.

TRADE MARKS AND TRADE NAMES CONTAINED AND USED HEREIN ARE THOSE OF OTHERS, AND ARE USED HERE IN A DESCRIPTIVE SENSE TO REFER TO THE PRODUCTS OF OTHERS.

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http://www.jensales.com/products/massey-ferguson-combine-service-manual-mh-s-mf750-760.html

MF 750/760COMBINES

SERVICE MANUAL1448 817 M4

TABLE OF CONTENTSPART 1 - GENERAL INFORMATION

PART 2 - ENGINE2-01 General Information2-02 Engines2-02-01 G.M. v-a 350 Engine (Gasoline)

Component Servicing Manual 1448 5442-02-02 Per~ins Workshop Manual for 6.372, 6.3542,

T6.354 and 6.354 Engines (Engine Codes TH and TR)2-02-03 Perkins AV8.540 Diesel E"ngi·ne Basic

Service Manual (Engine Code XC)2-02-04 Perkins Workshop Manual for T6.3544,

6.3544 and 6.3724 Engines (Engine Codes TU and TV)2-03 Fuel Systerrt2-04 Air Intake System2-04-01 Turbochargers (Holset 3LD and Airesearch T-04)

" Component Servicing Manual 1448 5472-05 Cooling System

PART 3 - POWER TRAIN3-01 Engine Outp"lJt Shaft3-02 Traction Drive3-03 Clutch Assembly (Traction)3-03-01 Clutch Assembly - MF 7603-03-02 Clutch Assembly - MF 750 - Double Plate3-03-03 Clutch Assembly - MF 750 - Nine-Inch3-04 Four-Speed Transmission (Prior to MF 750

Serial Number 09674 and MF 760 Serial Number 05829)3-05 Constant Mesh Transmission (MF 750 Serial Number

09674 and MF 760 Serial Number 05829 and following)

PART 4 - HYDRAULICS4-01 General Information4-02 Hydraulic Pump and Reservoir4-03 Main Control Valve4-04 Electro-Hydraulic Control Valve (Automatic Header Height)

Service Information Manual 1448 6404-05 Hydrostatic Transmission Hydraulic System4-05-01 Hydrostatic Pump/Motor System (Sundstrand)4-05-02 Hydrostatic Drive Components (Sundstrand)

Component Servicing Manual 1448 5484-05-03 Eaton Pump and Motor

Service Information Manual 1448 6424-06 Power Steering4-10 Trouble-Shooting

-1-

TABLE OF CONTENTS (Continued)

PART 5 - ELECTRICAL5-01 General Information5-02 Specifications and Wiring Diagrams5-03 Charging System5-03-01 Delco Alternator and Starter Motor

Component Servicing Manual 1448 5455-03-02 Motorola Alternator (MA Series)

Component Servicing Manual 1448 5495-04 Starting System - Refer to Part 5-03-015-05 Monitor System5-05-01 Fourteen Channel Monitor and Tachometer

Service Information Manual 1448 641

PART 6 - CAB AND AIR CONDITIONING6-01 Air Conditioning - Tecumseh Compressor6-02 Air Conditioning - Delco Compressor Installation6-02-01 Delco-Frigidaire Compressor

Component Servicing Manual 1449 550

PART 7 - WHEEL AND AXLE COMPONENTS7-01 Final Drive Unit7-02 Brakes and Brake Systems7-05 Rear Axle and Pivot7-05-01 Single C"ylinder Steering7-05-02 Twin Ram Steering

PART 8 - HEADER UNITS (QUICK-ATTACH)8-01 -01 Knife Drive (VVobble Box)

Component Servicing Manual 1448 546

PART 9 - THRESHING AND SEPARATING COMPONENTS9-01 Stone Trap and Feed Plate9-02 Front Beater9-03 Cylinder Drive9-04 Cylinder and Concave9-05 Rear Beater9-06 Main Grain Pan9-07 Straw Walkers and Pan-Under-Walkers9-08 Rethresher and Returns System

PART 10 - MATER1AL DELIVERY COMPONENTS10-01 Header Elevator10-02 Clean Grain System10-03 Unloading System

-2-

CAMSHAFT

CAUTION: All camshaft journalsare same diameter and caution mustbe used in removing camshaft toavoid damage to bearing.

Camshaft bearing journals are 1.8682"-1.8692" indiameter. Check journals with a micrometer for anout-ot-round condition. If journals exceed .001" out­of-round, camshaft should be replaced.

Camshaft should be checked for alignment. Bestmethod is by use of "V" blocks and a dial indicator,Fig. 21. Dial indicator will indicate exact amount

Fig. 20 - Removing Camshaft

Fig. 21 - Checking Camshaft Alignment

INSPECTION

A

1. Remove inlet manifold and valve lifters as pre­viously outlined.

2. Remove timing chain and camshaft sprocketas previously described.

3. Install two bolts, 5/16" - 18 x 4" in two ofcamshaft bolt holes. Remove camshaft from engine,Fig. 20.

REMOVAL

Fig. 19 - Installation of Timing Chain

Fig. 18 - Timing Sprocket "0" Marks

10

To Dismantle Oil CoolerNaturally Aspirated E-ngines - Right Hand Mounting(see Fig. L.12)

Remove single screw and locking tab at top of cooler.

Remove three screws at bottom of cooler and removeclamp plate.

Push tube stack down and remove top "0" ring.

Remove tube stack out of top of cooler body and removebottom "0" ring.

To re-assemble cooler, reverse the order of dismantling.New "0" rings should be used, these being lightly oiledbefore fitting.

With this cooler, where the coolant feed is taken fromthe side of the cylinder block, if it is necessary to replacethe adaptor which is a push fit in the block, then it fnustbe fitted using Loctite Retaining Compound Grade 75.

To Test an Oil CoolerSuitable adaptors, incorporating pressure connectionsmust be fabricated to blank off oil ports and waterconnections.

To test water sideFill water side with water and immerse the unit in water,ensuring absence of trapped air.

Pressurise water side with air at a pressure of 30lbf/in 2

(2,11 kgf/cm 2) or 207kN/m2 and examine for leaks.

To test oil sideWith water side filled with water and unit immersed inwater, pressurise oil side at a pressure of 90lbf/in2

(6,33kgf/cm2 ) or 620kN/m2 for turbocharged engines or60lbf/in 2 (4,22kgf/cm2 ) or 414kN/m 2 for naturallyaspirated engines. Test for two minutes and examinefor leaks.

The tube stack should be rejected if bubbles persistfrom the water inlet or outlet connections.

Adaptor- Cooler to Cylinder Block(where fitted)

The adaptor may be released by removi.ng the securingsetscrew, see Fig. L.13.

When refitting use a new joint and suitable sealingcompound and secure with setscrew, plain washer andspring washer.

To Refit Oil CoolerThe joint, lubricating oil cooler to adaptor block, must befastened to the oil cooler flange with an approved adhesive;"Bostik" clear, "Evostik" or Dunlop SN1901.

There must not be any sealant between the joint and theadaptor block. This side of the joint must be fitted dry.

Refit the oil cooler to adaptor or cylinder block andsecure with five setscrews, plain and spring washers.

Refit the oil filter with four setscrews and spring washersor refit filter canisters.

Reconnect the cooler inlet and outlet connections.

Ensuring that the water and oil drain plugs are fitted,refill the cooling system.

Start the engine, but do not speed the engine until oilpressure is achieved.

Check for oi I and water leaks.

6.3544 Series Workshop Manual. October 1989

LUBRICATING SYSTEM L7

L.12 t 11. Coolant Drain Plug2. Lubricating Oil Drain Plug

L.13

Fig. 31 - Installing Clutch Release Fingers1. Head End of Clevis Pin

Fig. 33 - Installing First Clutch DiscInto Pulley Section

1 . Hub Side of Disc 2. Bearing Shield

over pressure plate ... compress assemblies asshown in Fig. 31 until release fingers can bealigned with their pivots. Install clevis pins andsecure with new cotter pins ... making sure thathead side of clevis pins are all installed at "rightside" of finger as shown.

c. Slowly release pressure holding assembliescompressed ... then install springs into releasefingers as shown in Fig. 32.6. Assemble clutch into pulley section as follows:

a. Check that bearing shield is installed overbearing then insert one clutch disc into pulleysection as shown in Fig. 33. Hub side of disc to beupward as shown in Fig. 34.

b. Install center plate over first clutch disc asshown in Fig. 35 ... then install second clutch discover center plate as shown in Fig. 36. Make surethat hub side of second clutch disc is upward asshown in Fig. 37.

c. Position pressure plate assembly (and castcover) over pulley section and temporarily in­stall the six retaining capscrews . . . tightencapscrews alternately and evenly to 14-22 ft.-Ibs.(19-29 N.m) and check release finger height ad-

Fig. 32 -··Installing Release Finger Springs

1 . Head Side of Clevis Pins

Fig. 34 - Hub Side of First Clutch Disc

justment as shown in Fig. 38. All three releasefingers are to be adjusted to dimension shown.(Measure from top of finger to bottom of straightedge placed across cast cover.)

d. Remove six retaining capscrews . . . theninstall clutch cover with dust seal as shown inFig. 21. Tighten capscrews alternately to 14-22ft.-Ibs. (19-29 N.m).

Fig. 35 - Installing Center Plate OverFirst Clutch Disc

-10- MF 750/MF 760 SUPPLEMENT

FIG. 80

4. Fig. 80, position shift collars, 1 and 2, and rev­erse shift arm, 3, in alignment with shift forks, 4and 5, and eccentric bolt, 6.

Install cover, using a new gasket.5. Adjust reverse shift eccentric bolt, Fig. 81.

a. Position rail, 1, in reverse detent location(all the way in).

b. Rotate eccentric bolt, 2, until reverse couplingteeth (on reverse shaft) bottom in mating teeth of

FIG. 81

FIG. 82

reverse gear. Fig. 53 shows coupler and reverseshift arm.

c. Hold bolt in position, 3, and tighten nut, 4,to 18 ft.-Ibs.6. Install inspection plate, 1, Fig. 82, clutch

driven transmission shown, left side.7. Fig. 83 shows left side of hydrostatic motor

driven transmission.

FIG. 83

-19-nAr".... -

QUICK TESTS

FIG. 51

FIG. 52

CAUTION: Before removing reliefvalve, lower, the header or elevator tothe extreme down position.

CAUTION: For your safety, ensure thatthe header (or elevator) and the reel arelowered as far as they will go, beforethe connection of a pressure gauge orthe opening of any hydraulic line or theremoval of any component.

Start and run the engine at full rpm. Raise theheader to maximum height. The pressure should be2300 (15.8 MPa) to 2400 psi (16.5 MPa). If pressure isnot correct it will be necessary to remove the reliefvalve to add or remove shims.

FIG. 51: When the header fails to raise or lower,check to ensure that there is electrical power to theraise or lower solenoid. Start the engine and depressand hold the header switch in the appropriatedirection. Hold a wrench close to the solenoid. Whenthe solenoid is energized, the magnetic field of thesolenoid will attract the wrench. Failure of thesolenoid to attract the wrench, indicates that electricalpower is not being supplied to that solenoid.

Before performing hydraulic test, insure the pumpdrive belt is properly tensioned and the hydraulicreservoir is filled to the correct level with therecommended fluid.

FIGS. 52 & 53: To test the relief valve, in theelectro-hydraulic valve, install a 5000 psi (45.6 kPa)test gauge at the test connections provided on theheader lift hydraulic line. Fig. 52, shows the locationfor the MF 750, 760, 850 and 860. The test connectionfor the MF 540/550 is installed at right-hand headercylinder, see Fig. 53.

FIG. 53FIG. 54: To test the relief valve in the main

control valve, install a 5000 psi (34.5 MPa) gauge atreel coupler. Activate the reel control to the raisedposition, increase the engine to full throttle, thegauge should register 1900 psi (13 MPa) minimum,2000 psi (13.7 MPa) maximum.

FIG. 54

34

COMPRESSOR PORT IDENTIFICATION

The compressor ports are identified by thewords "suction" and "discharge" cast in theblock of the compressor. Refer to Rig. 5.

In a properly connected system, the suctionport hose is connected to the evaporator. Whenthe compressor has been operating, it is thecoolest of the two fittings.

The high pressure port hose is connected tothe receiver-dehydrator.

If there is still any question about inlet andoutlet, rotate the compressor by hand and deter­mine which port produces a vacuum. This is theinlet port.

DISCHARGING THE SYSTEM - Fig. 6After putting goggles on and attaching the

gauge set:

1. Connect the service hose to center con­nector on manifold, then place other end in aventilation outlet or out a window.

2. Open valves on gauge set slightly sothat charge is released at a safe rate and no oilis lost from the compressor.

3. When hissing stops, complete charge is-let out. Close hand valves on manifold gauge.

EVACUATING THE SYSTEM - Fig. 7

After replacing any part, it is necessary toevacuate the system to remove any air presentbefore system is recharged. The air may be re­moved after only a few minutes of pumping, how­ever 20 to 30 minutes is required to removemoisture from the system.

IMPORTANT: The system may show that itwill not leak under a vacuum, but this doesnot mean it will not leak under pressure.Leak detection under pressure must be per­formed.

Fig. 5 - Gauge Set Attached

Fig. 6 - Discharging the System

Fig. 7 - Evacuating the System

Attach the gauge set and discharge the sys­tem as previously described and proceed asfollows:

-6-

BEARING(S) REPLACEMENT

The front beater is accessible after the elevator(table-to-cylinder) is removed ... see Fig. 5.

The front beater shaft's left bearing assembly(and housing) may be replaced by moving thetransmission's shift rods out of the way, removingthe bearing housing retaining nuts (and lockwashers)and using puller bolts as shown in Fig. 6 to removebearing from shaft.

To replace the front beater's right-hand bearingrequires the removal of the beater shaft and vane... as an assembly ... see "Shaft and Beater VaneReplacement" .

NOTE: Front beater bearings and related partseither as illustrated in Fig. 1 ... OR Fig. 2.Double sprocket arrangement is as shown inFig. 3 and may be removed (or installed)without having to move beater shaft to left... see Fig. 4. Be sure correct replacementparts are used and that idler sprocket assemblyis correctly aligned with double sprocket.

Fig. 1 - Front Beater Bearings and RelatedParts - Used M F 760 Prior to 1746 00511

Fig. 2 - Front Beater Bearings and RelatedParts - Used all MF 750'5 and MF 760'5

Serial No. 1746 00511 and Up7. Bearing8. Seal9. Spacer

1O. Setscrew11. Double Sprocket12. Idler Sprocket Arrangement

1. Shield2. Gasket3. Bearing4. Left Bearing Housing5. Anti-Wind Shields6. Right Bearing Housing,0

I @(j)

,I ,'/

~(~/ \'

.~~-

1. BearingZ. Left Bearing Housing3. Anti-Wind ShieldsJ. Right Bearing Housingi. Bearing

6. Spacer7. Washer8. Setscrew9. Single Sprocket

10. Idler Sprocket Arrangement

Fig. 3 - Double Sprocket Installed at RightSide of Front Beater

1. Idler Sprocket Assembly 3. Nut2. Double Sprocket Assembly 4. Setscrew

-2-

Fig. 2 - Drive to Vertical Auger(Viewed from Bottom)

UNLOADER BOTTOM ANDVERTICAL AUGERS

MF 750 bottom and vertical unloader augers (anddrives) are as illustrated in Fig. 1. Drive arrangementto vertical auger is as shown in Fig. 2. Bottom augermay be removed in following manner:

1. Disconnect chain from main sprocket and chainbetween inside of main sprocket and sprocket onbottom auger. See Fig. 3.

2. Remove cover and bolts holding right-handbearing on bottom auger to grain tank ... see Fig.4.

3. Remove bottom unloader auger to left side ofmachine as shown in Figs. 5 and 6. Check that

Fig. 3 - Drive at Left Side of Unloader- MF 750

Fig. 4 - Bearing on Bottom Unloader Augerat Right Side - MF 750

Fig. 5 - Bolts in Cover at Left Side of BottomAuger Removed and Auger Moved to Left Side

of Machi-ne - MF 750

Fig. 6 - Removing/Installing Bottom UnloaderAuger through Left Side of Machine - MF 750

PART 10-03 -3-