AGCO Challenger MT255B Bedienungsanleitung

Part Number 79024230 A Rev. (English)

Printed in U.S.A.

November 2006

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

79024230 A Rev. 01-i

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 .................................................................................................................................... 01-7

General Precautions for Separation and Re-Installation ............................................................................... 01-8

Before Operation ..................................................................................................................................... 01-8

Precautions to be Followed When Installing Common Parts .................................................................. 01-8

INDEX ............................................................................................................................................................. 01-11

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01-ii 79024230 A Rev.

Contents

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79024230 A Rev. 01-1

General Information

GENERAL INFORMATION

TRACTOR TYPES AND PUNCHED

IDENTIFICATION MARKS

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.

FIG. 1

i-9686b

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General Information

01-2 79024230 A Rev.

Name Plate

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.

FIG. 2

i-9063 i-9751

i-9394

FIG. 3

i-9753

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79024230 A Rev. 01-3

General Information

Specifications

TABLE 1

1528 / ST28A / MT255B

4WD

1531 / ST33A

4WD

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)

Wheel base 1665 (65.6)

Wheel tread Front (6-14) 960 (37.8)

Rear (12.4-16) 1096 (43.2)

Minimum ground clearance (under PTO

bottom)

200 (7.9)

Minimum turning radius: without brake 5600 (220.5)

Weight (with Rops and Seat) lb (kg) 1000 (2204.6)1005 ( 2215.6)

1100 (2423)

ENGINE

Make Iseki Diesel

Model E3CF-VB22 E3CD-VB32

Type Water-cooled, 4-cycle, 3-cylinder, Diesel, Indirect injection,

overhead valve

Aspiration Natural

Displacement in3(cc) 1463 (89.3) 1498 (91.4)

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General Information

01-4 79024230 A Rev.

ENGINE (Cont)

Number of Cylinders 3

Bore mm (inch) 86 (3.39) 87 (3.43)

Stroke mm (inch) 84 (3.30)

Engine Horsepower (Gross) 21.2 kWh (28.4 HP)

@ 2500 rpm

24.6 kW (33.0 HP) @ 2600 rpm

(Net) 20.6 kW (28.0 PS)

@ 2500 rpm

23.5 kW (32.0 PS) @ 2600 rpm

PTO Horsepower (Estimate) 22.3 HP @ 581 PTO RPM 25.9 HP @ 604 PTO RPM

Firing Order 1-3-2

Compression Ratio 21.7 to 1

Combustion chamber type Swirl type

Low Idle Speed rpm 930-970 980-1020

High Idle Speed rpm 2650-2750 2760-2860

Valve Clearance (Cold); Intake mm (inch) 0.35 (0.014)

Valve Clearance (Cold); Exhaust mm (inch) 0.35 (0.014)

Air Cleaner Single stage, dry element

Engine Cooling Liquid, forced circulation

Starting method Starter motor with pre-heater

Cold Starting Aid Glow plugs (3)

Fuel Diesel

TABLE 1

1528 / ST28A / MT255B

4WD

1531 / ST33A

4WD

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79024230 A Rev. 01-5

General Information

1528 / ST28A / MT255B

4WD

1531 / ST33A

4WD

Chassis

Clutch Main None

Rear/ Mid PTO Hydraulically engaged, multi-plate wet disk

Transmission Main Infinite control

Sub 3 speeds sliding mesh

Differential Bevel gears with differential lock

Brakes Wet, multi-disc, mechanical

Steering system Orbit roll hydrostatic

Tire size (Agri) Front 25 x 8.50 - 14

Rear 12.5/80 - 18

Axle type Front Center-pin

Rear Center-axle

Maximum axle loading kg (lb) Front 465 (1025)

Rear 635 (1400)

Implement Lift

Operation Hydraulic

Mounting method 3-point hitch

Drawing method Trailer hitch

3-point hitch category Category 1

Self-control Position (OPT draft control)

Lift capacity (at the ball ends of lower links)

kg (lb)

1100 (2425)

Power Take-Off (PTO)

Type Independent, engine driven

Control Electro-hydraulic control

Clutch Hydraulically engaged, multi-plate wet disk

Rear PTO; Shaft mm (inch) 35 (1.375) diameter, six spline

Output Clockwise rotation

PTO Speed @ engine rpm 581@2500 604@2600

Hydraulics

Steering System; Type Hydrostatic (power)

Pump Engine-mounted gear pump

Maximum Output 9.8 l/min (2.6 U.S. gal/min) at

2500 rpm

10.2 l/min (2.7 U.S. gal/min) at

2600 rpm

Pressure psi (k) 1711 psi

Main Hydraulic System; Pump Engine-mounted gear pump

Maximum Output 28.0 l/min (7.4 U.S. gal/min) at

2500rpm

29.2 l/min (7.7 U.S. gal/min) at

2600rpm

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General Information

01-6 79024230 A Rev.

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. qts. (liters) 3.6 (3.8 ) 5.0 (5.3)

Transmission U.S. gals. (liters) 7.7 (29.0)

Fuel tank U.S. gals. (liters) 30.0 l (7.9 gal)

Cooling system U.S. qts. (liters) 5.5 (5.8)

Front drive axle U.S. qts. (liters) 4.5 (4.7)

1528 / ST28A / MT255B

4WD

1531 / ST33A

4WD

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79024230 A Rev. 01-7

General Information

Traveling Speeds

NOTE: Model 1528 tractors - Ground speed indicated at

2500 engine rpm with 12.5/80-18 agriculture type

rear tires, 36 x 13.5-15 turf and 12.5/80-18 R-4

tires.

Model 1531 tractors - Ground speed indicated at

2600 engine rpm with 12.5/80-18 agricultural

type rear tires, 36 x 13.5-15 turf and 12.5/80-18

R-4 tires.

Shift

Position

1528 / ST28A / MT255B 1531 / ST33A

Range mph kph mph kph mph kph mph kph

Tire Turf Ag Turf Ag

Forward

Hydrostatic

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

Reverse

Hydrostatic

2.19 3.52 2.29 3.68 2.27 3.66 2.38 3.83

4.70 7.57 4.93 7.93 4.89 7.87 5.12 8.24

8.76 14.09 9.17 14.75 9.11 14.65 9.53 15.34

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