AGCO Challenger MT255B User manual

© AGCO Corporation, 2006 All rights reserved.
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
23
1
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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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