SHOP MANUAL
ALLIS-CHALMERS
MODELS D-21, D-21 SERIES II, TWO-TEN AND TWO-TWENTY
Tractor serial number is located on the front flange of the torque (clutch)
housing at left hand side of tractor. Engine serial number is located on
nameplate which is attached to the upper rear corner of cylinder block
on the left hand side of tractor.
Model D-21 tractors were available with a naturally aspirated diesel en-
gine. D-21 Series II, Two-Ten and Two-Twenty tractors are equipped with a
turbo-charged diesel engine. All models are available with an adjustable,
wide front axle. Two-Twenty models are also available with a driving
front axle (Front Wheel Assist).
INDEX (By Starting ParagrapK)
BRAKES
Adjustment (D-21 & D-21 Series ID
105
Two-Twenty
106
R&R and Overhaul (D-21 &
D-21 Series 11)
105A
Two-Twenty
106A
CLUTCH
Engine Clutch
72
Engine Clutch Shait
76
COOLING SYSTEM
Radiator
67
Water Pump
68
DIESEL FUEL SYSTEM
Filters and Bleeding
51
Injection Pump
56
Injection Pump Gears
34
Nozzles
53
DIFFERENTIAL
Adjustment
95
R&R and Overhaul
96
F.W.A
172
ELECTRICAL
70
ENGINE
Assembly—R&R
20
Cam Followers
26
Camshaft
36
Connecting Rods & Bearings
41
Crankshaft & Bearings
42
Cylinder Head
21
Cylinder Sleeves
39
ENGINE (Cont)
Flywheel
45
Front Oil Seal
43
Injection Timing
56
Main Bearings
42
o n Cooler
49
Oil Pan
46
Oil Pump
47
Piston Pins
40
Piston & Rod Removal
38
Pistons & Rings
39
Rear Oil Seal
44
Rocker Arms
27
Speed Adjustments
58
Timing Gear Cover
30
Timing Gears
31
Turbochargar
60
Valve Guides
24
Valves & Valves Seats
22
Valve Springs
25
FINAL DRIVE & DIFFERENTIAL
Bevel Gears, Adjust
97
Bull Gears, Renew
100
Bull Pinion Bearings, Adjust
99
Bull Pinion, Renew
99
Differential Overhaul
96
Wheel Axle Shafts
103
FRONT SYSTEM (Without Front Wheel Assist)
Adjustable Front Axle
1
Power Steering
8
FRONT WHEEL ASSIST
Drive Adapter
165
Front Axle Assembly
168
Idler Gear, Shaft and Bearings
167
Lubrication
164
Power Steering
8
POWER LIFT SYSTEM
Checks and Adjustments
12L 123
Filters
.1