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Gravely Convertible 7.6 Service Manual

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Summary of Contents for Gravely Convertible 7.6

  • Page 2 Convertible 7.6 tractor, and as an aid in diagnosis and repair. This manual cannot take the place of proper routine maintenance, care and adjustments. Gravely reserves the right to change specifications, or design at any time without notice or incurring obligation. LH means Left Hand.

  • Page 3: Table Of Contents

    TABLE OF CONTENTS Trouble Shooting (Engine) Air Intake System Lubrication Fuel System Electrical System Governor Cleaning Engine Tests Engine - General Service Engine Reconditioning Cylinder Reconditioning Transmission Trouble Analysis Forward-Reverse High-Low Differential (2-Speed) Differential (Std)
  • Page 4 SAFETY PROCEDURES IT IS TOO LATE TO REMEMBER WHAT SHOULD HAVE BEEN DONE AFTER THE ACCIDENT HAS HAPPENED. Many hours of lost time and much suffering can be caused by the failure to practice simple safety rules. 1. Make sure the work area is clear of objects that might be picked up and thrown. 2.

  • Page 5: Trouble Shooting (Engine)

    TROUBLE SHOOTING CONDITION POSSIBLE CAUSE Faulty Ignition. A. Hard Starting or Loss of Power Check for dirty air cleaner first. a. Loose or grounded high tension or breaker point leads. b. Improper breaker point gap and timing. c. Defective breaker points. d.

  • Page 6: Air Intake System

    Handle new element carefully - do not use if the gasket surfaces are bent, twisted or damaged in any way. Use only genuine Gravely elements. Use of other elements will void warranty. Not only must the proper element be used but it must be properly installed to prevent unfiltered air from entering the engine.

  • Page 7: Fuel System

    FUEL SYSTEM CARBURETOR Figure 3 Figure 2 A. Adjustment 1. Screw the main jet adjustment needle (a brass T-needle) in until it is snug. Do not force or screw it tightly. 2. Back off the main jet adjustment needle 1'z turns. 3.
  • Page 8 and suction are increased, the mixture ratio must be rapidly reduced. This change is accomplished through adjustment of the choke valve and the automatic opening of the poppet valve to admit more air when the engine fires. SEPARATE CARBURETOR BODIES (a) Remove the four assembly screws using a screw driver.

  • Page 9: Electrical System

    (c) Install main jet and fibre washer. (c) Install fuel valve seat and fibre washer. (d) Install the drain plug (hex) in threaded passage bottom of (d) Install fuel valve needle in seat followed by float and float axle. fuel bowl (e) Install main jet adjustment seat lightly and back out 1 1/2 SEE FIGURE 7.

  • Page 10: Governor

    plate until the opening is .015", measuring with a feeler gauge of that thickness, tighten the two clamp screws. To replace the contacts remove the breaker, the spring clamp screw, the breaker arm lock and washer, and then lift the breaker arm from its pivot.

  • Page 11: Cleaning

    Replace seals if damaged or worn. Re-assemble the governor in the reverse order of disassembly. IMPORTANT: Pack the internal component parts, especially the bearings, pins, shafts and all rotating and sliding parts, with lubricant. A total of 3 ounces of this lubricant is to be packed within the governor housing, in order to supply maintenance-free operation of the governor.

  • Page 12: Engine General Service

    ENGINE GENERAL SERVICE COOLING EXTERNAL SURFACES External surfaces (tractor as well as engine) must be If tractor is getting hot, check for blockage of the cooling maintained in a clean condition, free of any dirt or oil system. Air is blown around the cylinder and across the accumulation which reduces cooling efficiency.

  • Page 13: Cylinder Reconditioning

    CYLINDER RECONDITIONING CYLINDER REMOVAL Remove the four nuts and washers securing the cylinder to Expose engine (Step 1-16 Engine Removal) the crankcase. Figure 14 Fig. 13 Lift the cylinder up off the crankcase and piston. Remove cylinder head and gasket. Loosen the nuts securing the valve guides to the crankcase.
  • Page 14 VALVES 4. Release the valve spring compressor, and remove valve ADJUSTMENT spring cap, valve spring and valve spring locator. Cold - intake .015 5. Remove valve from cylinder. exhaust .015 6. Repeat steps 3, 4, and 5 for other valve. VALVE REMOVAL Remove cylinder from engine.
  • Page 15 PISTON - RINGS Pistons and rings are available in standard, .005; .010; .015; .020; .025 and .030 oversize. Be sure to use the correct rings with the correct pistons. Also, be sure the pistons and rings are correct for the rebored cylinder. Never reuse old rings.
  • Page 16 Fig. 21 Fig. 20 Support ends of timing pinion shaft and drive pinion shaft between two centering spindles. Using a dial indicator check run out and balance flywheels to within .005 TIR.
  • Page 17 4. If not previously removed, remove the allen screw from the end of the drive pinion shaft. 5. Using the special Gravely Crankcase Assembly Puller, assemble the crankcase together. Install the setscrew in the inner crankcase against the drive pinon rearing...

  • Page 18: Engine Assembly

    ENGINE ASSEMBLY Install the valve guide and plunger assemblies on each side of the crankcase, do not tighten. Install a new gasket to the four studs on the crankcase. Support the piston assembly and start the cylinder assembly down over the piston and rings. Figure 24 Guide the cylinder down over the piston guiding the valves and springs into the valve guides and the cylinder over the...

  • Page 19: Transmission Trouble Analysis

    TRANSMISSION TROUBLE ANALYSIS TROUBLE DETERMINATION CAUSE SOLUTION Clutches engaged; Tractor drive wheels Bound linkage, missing clevis Repair linkage. will not turn. pins. Bent clutch rods, bent or broken actuating shaft levers. Engage P.T.O. and Hi-Lo planetary, Broken drive pinion shaft. Replace parts as required.

  • Page 20: Pto

    If nothing abnormal is found, remove the attachment dog When internal PTO problems are suspected, remove the and pinion shaft. Check for wear or damage and check pinion attachment or attachment cover plate and check the shifting shaft for twisting. mechanism.

  • Page 21: High-Low

    HIGH - LOW Figure 29 When internal high-low planetary problems are suspected, it is necessary to remove the engine as described on page Rotate the actuating lever to release the planetary system. Carefully examine parts for damage, abnormal or excessive wear.
  • Page 22 19. Reassemble the differential mechanism using new thrust needle bearings if any other parts were replaced. On the two spider arms with snap ring grooves at the end, assemble in this sequence, spider gear, shifting train pinion, bearing, spacer and snap ring. On the other two arms assemble in this sequence: spider gear, race, bearing, spacer and snap ring.
  • Page 23 STANDARD DIFFERENTIAL Removal Raise tractor and remove wheels. Drain tractor transmission of oil. Remove axle and housing. Remove differential assembly. Fig. 34 Fig. 33 Carefully check the bearings and gears for wear or damage. Replace excessively worn or damaged parts. Reassembly differential back in tractor using an equal amount of shims on each axle housing.
  • Page 24 TORQUE VALUES - STANDARD HARDWARE ITEMS SIZE TORQUE SIZE TORQUE 1/4 - 20 70 in. lbs. 1/2 - 13 50 ft. lbs. 1/4-20 85 in. lbs. 1/2 - 20 70 ft. lbs. 5/16-18 150 in. lbs. /16 - 12 75 ft. lbs. 5/16-24 165 in.

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