AGCO Challenger MT255B Service Manual
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AGCO Challenger MT255B Service Manual

AGCO Challenger MT255B Service Manual

Hydrostatic compact tractor
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®
Challenger
MT255B
Hydrostatic Compact Tractor
SERVICE MANUAL
79024230 A Rev.
CONTENTS
GENERAL INFORMATION ....................................................................................................................................01
SPLITTING THE TRACTOR...................................................................................................................................02
ENGINE ............................................................................................................................................................... 03A
ENGINE ACCESSORIES .................................................................................................................................... 03B
TRANSMISSION.....................................................................................................................................................04
HYDROSTATIC TRANSMISSION ..........................................................................................................................05
FRONT AXLE .........................................................................................................................................................06
REAR AXLE HOUSING .........................................................................................................................................07
STEERING..............................................................................................................................................................08
HYDRAULICS ........................................................................................................................................................09
ELECTRICAL ACCESSORIES ..............................................................................................................................10
© AGCO Corporation, 2006 All rights reserved.
Part Number 79024230 A Rev. (English)
Printed in U.S.A.
November 2006

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Summary of Contents for AGCO Challenger MT255B

  • Page 1: Table Of Contents

    ENGINE ................................03A ENGINE ACCESSORIES ............................ 03B TRANSMISSION..............................04 HYDROSTATIC TRANSMISSION ..........................05 FRONT AXLE .................................06 REAR AXLE HOUSING ............................07 STEERING................................08 HYDRAULICS ................................09 ELECTRICAL ACCESSORIES ..........................10 © AGCO Corporation, 2006 All rights reserved. Part Number 79024230 A Rev. (English) Printed in U.S.A. November 2006...

  • Page 2: 01 - General Information

    Contents ® Challenger MT255B Hydrostatic Compact Tractor SERVICE MANUAL 79024230 A Rev. 01 - General Information Contents GENERAL INFORMATION Tractor Types and Punched Identification Marks ..................01-1 Name Plate .............................. 01-2 Specifications ............................01-3 1528 / ST28A / MT255B 4WD ..............................01-3 Traveling Speeds ............................
  • Page 3 Contents 01-ii 79024230 A Rev. Find manuals at https://best-manuals.com...

  • Page 4: General Information

    General Information GENERAL INFORMATION TRACTOR TYPES AND PUNCHED IDENTIFICATION MARKS i-9686b FIG. 1 FIG. 1: Shown is the Model name plate (1). Punched model name and serial number (2) is on the right side of the frame. Cast engine model name and punched engine serial number (3) on the right side wall the cylinder block.

  • Page 5: Name Plate

    General Information Name Plate i-9063 i-9751 i-9394 FIG. 2 FIG. 2: Model name plate. FH………HST transmission, 4WD M………Mid-PTO D…………Dual clutch R………….ISEKI ROPS (optional) E41……….Agri tires FIG. 3: Engine model and serial number. i-9753 FIG. 3 01-2 79024230 A Rev. Find manuals at https://best-manuals.com...

  • Page 6: Engine

    General Information Specifications TABLE 1 1528 / ST28A / MT255B 1531 / ST33A Dimensions (with Agri-tires): (inch) mm Overall length 2855 (112.4) Overall width 1360 (53.5) Ag and Turf Tires 1680 (66.1) R4 Tires Overall height (to the top of steering wheel) 1400 (55.1) Overall height (to the top of ROPS) 2050 (80.7)

  • Page 7: Engine Accessories

    General Information TABLE 1 1528 / ST28A / MT255B 1531 / ST33A ENGINE (Cont) Number of Cylinders Bore mm (inch) 86 (3.39) 87 (3.43) Stroke mm (inch) 84 (3.30) Engine Horsepower (Gross) 21.2 kWh (28.4 HP) 24.6 kW (33.0 HP) @ 2600 rpm @ 2500 rpm (Net) 20.6 kW (28.0 PS)

  • Page 8: Transmission

    General Information 1528 / ST28A / MT255B 1531 / ST33A Chassis Clutch Main None Rear/ Mid PTO Hydraulically engaged, multi-plate wet disk Transmission Main Infinite control 3 speeds sliding mesh Differential Bevel gears with differential lock Brakes Wet, multi-disc, mechanical Steering system Orbit roll hydrostatic Tire size...

  • Page 9: Front Axle

    General Information 1528 / ST28A / MT255B 1531 / ST33A Hydraulics (Cont’d) Pressure Relief valve setting 14715 kPa (2134 psi) Electrical system System voltage 12 volt, negative (-) ground Battery cca @ 0F(-18) 582 cca Charging 40 amp alternator with internal regulator/rectifier Capacities Engine crankcase with filter U.S.

  • Page 10: Traveling Speeds

    General Information Traveling Speeds Shift 1528 / ST28A / MT255B 1531 / ST33A Position Range Tire Turf Turf Forward 3.12 5.02 3.27 5.26 3.25 5.22 3.40 5.47 6.72 10.81 7.04 11.32 6.99 11.25 7.32 11.78 12.51 20.13 13.10 21.08 13.01 20.93 13.62 21.92...

  • Page 11: General Precautions For Separation And Re-Installation

    Lifting it up with a jack only is a dangerously unstable procedure. When replacing parts, use authorized, genuine AGCO parts only. AGCO assumes no responsibility for accidents, operating problems or damage caused by the use of imitation parts.
  • Page 12 General Information Snap Rings Snap ring installers should be designed so as not to permanently deform the snap rings. Installed snap rings should be seated securely in the groove. Be careful not to overload the snap-ring to the extent that it is permanently deformed.
  • Page 13 General Information Bolts and Nuts Special bolts are installed at several locations, so be sure not to interchange them with other bolts. Bolts and nuts should be tightened to their specified torque with a torque wrench. When locking the bolts or nuts with wire or a lock washer, be sure to wind the wire paying sufficient attention to its winding direction and bend the lock washer for secure locking.

  • Page 14: Index

    Index INDEX Punched Identification Marks ....... 01-1 Bolts and Nuts ............ 01-10 Capacities ............01-3 Cotter Pins ............01-9 General Precautions for Separation and Re-Installation ..........01-8 Grease Fittings ........... 01-10 Hardware ............01-10 Name Plate ............01-2 Oil Seals ............... 01-8 O-Rings ..............
  • Page 15 Index NOTES 01-12 79024230 A Rev.
  • Page 16 Contents ® Challenger MT255B Hydrostatic Compact Tractor SERVICE MANUAL 79024230 A Rev. 02 - Splitting the Tractor Contents SPLITTING THE TRACTOR Disassembly of Function Blocks ........................02-1 Removing/Reinstalling Side Covers ......................02-1 Hood and Front Grill ..........................02-2 Seat, Fenders, Floor Deck, and Related parts ....................02-4 Remove the Exterior parts as a Set .......................
  • Page 17 Contents NOTES 02-ii 79024230 A Rev.

  • Page 18: Splitting The Tractor

    Splitting the Tractor SPLITTING THE TRACTOR DISASSEMBLY OF FUNCTION BLOCKS FIG. 1: To release the hood, move the open/close lever (1) in the direction shown by the arrow. Open the hood by grasping and lifting up the front of the hood (2) fully until locking the stand of the hood.

  • Page 19: Hood And Front Grill

    Splitting the Tractor Hood and Front Grill FIG. 4: Open hood. Unplug headlight wires. I-10357 FIG. 4 FIG. 5: Unpin hood support (1) at the engine bracket. I-10358 FIG. 5 FIG. 6: Remove clip (1) and washer. Remove hood off pins.
  • Page 20 Splitting the Tractor FIG. 7: Remove bolts from the screen and remove the screen. MFC8164 FIG. 7 79024230 A Rev. 02-3...

  • Page 21: Seat, Fenders, Floor Deck, And Related Parts

    Splitting the Tractor SEAT, FENDERS, FLOOR DECK, AND RELATED PARTS FIG. 8: Remove two bolts and remove the differential lock lever (1). Remove a screw and remove the lowering speed control knob (2). Remove two bolts and remove the cruising speed control lever.
  • Page 22 Splitting the Tractor FIG. 11: Remove hydraulic control levers (1 and 2). Remove fixing bolts and remove fenders. i-9760 FIG. 11 FIG. 12: Remove four screws and remove column cover (forward and rearward). i-9761 FIG. 12 FIG. 13: Remove six screws and disconnect couplers for related wiring harness.
  • Page 23 Splitting the Tractor FIG. 15: Remove two screws and loosen two bolts (1). Disconnect the coupler for meter panel and disconnect tachometer cable. Remove front cover. i-9764 FIG. 15 FIG. 16: Remove two bolts fixing fuse box (1). Remove two bolts per one side (total four bolts) (2) and remove the engine hood stay.
  • Page 24 Splitting the Tractor FIG. 19: Disconnect the fuel return hose (1). Disconnect the hydraulic hose, which connects the orbit roll with the reducing valve. Disconnect the hydraulic hose which connects the orbit roll with the charge filter. i-9768 FIG. 19 FIG.
  • Page 25 Splitting the Tractor FIG. 23: Remove the front rubber mounting bolt (1). i-9773 FIG. 23 FIG. 24: Remove the floor frame fixing bolts (1). Remove the floor frame. i-9774 FIG. 24 FIG. 25: Remove rear mount fixing bolts. Remove lower frame. i-9775 FIG.

  • Page 26: Remove The Exterior Parts As Aset

    Splitting the Tractor REMOVE THE EXTERIOR PARTS AS A The fender, frames, steeling post and fuel tank can be removed as a set if necessary. Remove the front grille, hood and side covers with reference to 1. HOOD AND FRONT GRILLE. Remove the column cover, rear cover and meter panel with reference to (14) to (17) of 2.
  • Page 27 Splitting the Tractor FIG. 28: Disconnect hydraulic hose (1) which connects the orbit roll power steering unit with the oil cooler. i-9778 FIG. 28 FIG. 29: Disconnect power steering hoses at the cylinder side. Release hoses from clamps. Disconnect the brake rods. i-9779 FIG.
  • Page 28 Splitting the Tractor FIG. 32: Remove the neutral switch (1). Remove front mount fixing bolts (LH and RH). Remove rear mount fixing bolts (LH and RH). i-9783 FIG. 32 FIG. 33: Lift up the frame set gradually making sure that all related wirings, pipes and links are disconnected.

  • Page 29: Radiator

    Splitting the Tractor RADIATOR Remove the engine hood, front grille, etc., ahead of time referring to 1. HOOD AND FRONT GRILLE. Drain the coolant. FIG. 34: Disconnect the upper hose and lower hose (1 and 2). Disconnect the drainpipe. Remove the setting bolts from radiator stay (3). Remove the setting bolts from the fun shroud (4) and shift it behind the fan.
  • Page 30 Splitting the Tractor FIG. 36: Slide couplers forward on shaft and remove shaft. Drain transmission oil. i-9787 FIG. 36 FIG. 37: Remove the suction pipe. i-9788 FIG. 37 FIG. 38: Remove the delivery pipe. i-9789 FIG. 38 FIG. 39: Disconnect hydraulic hoses for power steering from the power steering cylinder.
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