Print No. 87734636C
Service Manual
21E
121E
221E
321E
Series 3
Compact Wheel Loaders
1
TO THE READER
This manual has been printed for a skilful engineer
to supply necessary technical information to carry
out service operations on this machine.
Read carefully this manual to collect correct infor-
mation relevant to repair procedures.
For any question or remark, or in case of any error
relevant the contents of this manual, please con-
tact:
CNH ITALIA S.p.A.
Via Plava, 80
10135 TORINO - Italy
REFERENCES
Beyond this Repair Manual, also refer to docu-
ments listed hereunder:
Operator’s Manual
Parts Catalogue
COMPLETE REPAIR MANUAL
The complete Repair Manual consists of two vol-
umes:
21E - 121E - 221E - 321E
Repair Manual for “Wheel loaders”
21E - 121E - 221E - 321E
Repair Manual for “Engine”
The Repair Manuals for “Wheel loaders” and “En-
gine” contain the necessary technical information
to carry out service and repair on machine and on
engine, necessary tools to carry out those opera-
tions and information on service standard, on pro-
cedures for connection, disconnection,
disassembly and assembly of parts.
The complete Repair Manual which covers the
loader models 21E - 121E - 221E - 321E consists
of the following volumes, which can be identified
through their print number as stated below:
VOLUME MACHINE TYPE PRINT NUMBER
Repair Manual - “Wheel loaders” 21E - 121E - 221E - 321E 87734636C
Repair Manual - “Engine” 21E - 121E - 221E - 321E 87736548A
2
TO PREVENT ACCIDENTS
The majority of accidents and injuries which occur in industry, on the farm, at home or on the
road, are caused by the failure of some individual to follow simple and fundamental safety rules
or precautions. For this reason MOST ACCIDENTS CAN BE PREVENTED by recognizing the
real cause and taking the necessary precautions, before the accident occurs.
Regardless of the care used in design and construction of any type of equipment, there may be
conditions that cannot be completely safeguarded against, without interfering with reasonable
accessibility and efficient operation.
A careful operator and / or technician is the best insurance against accidents. The complete ob-
servance of one simple rule would prevent many thousands of serious injuries each year.
This rule is: never attempt to clean, lubricate or adjust a machine while it is in motion.
S WARNING
Before carrying out any maintenance operation, adjustment and or repair on machines equipped
with attachments, controlled hydraulically or mechanically, make sure that the attachment is low-
ered and safely set on the ground. If it is necessary to have the equipment partially or fully raised
to gain access to certain items, be sure the equipment is suitably supported by means other than
the hydraulic lift cylinders, cable and /or mechanical device used for controlling the equipment.
NOTE: in this manual, the abbreviations of the models are the same as in the following table.
CNH S.p.A.
Via Plava, 80
10135 TORINO - Italy
All rights reserved. Reproduction of text or illustrations, in whole or in part, is strictly
prohibited.
21E Series 3 21E
121E Series 3 121E
221E Series 3 221E
321E Series 3 321E
INDEX
SECTION 00 - INTRODUCTION
1. SAFETY INSTRUCTIONS ............................................................................................................................ 1
1. GENERAL SAFETY INSTRUCTIONS .......................................................................................................... 2
1. TECHNICAL SPECIFICATIONS................................................................................................................. 12
SECTION 10 - ENGINE
1. DIESEL ENGINE .......................................................................................................................................... 1
2. FUEL SYSTEM ............................................................................................................................................. 2
3. COLD START DEVICE (NORTH AMERICA) ............................................................................................... 5
SECTION 25 - FRONT AXLES
1. REMOVAL AND INSTALLATION ................................................................................................................. 1
2. DIMENSIONS ............................................................................................................................................... 4
3. TECHNICAL SPECIFICATIONS................................................................................................................... 5
4. OIL CHANGE .............................................................................................................................................. 10
5. DISASSEMBLY AND ASSEMBLY.............................................................................................................. 13
5.1 DISC BRAKE ASSY (21E) ................................................................................................................... 13
5.2 BRAKE CALIPER ................................................................................................................................ 20
5.3 REDUCTION GEAR (21E)................................................................................................................... 25
5.4 REDUCTION GEAR (121E, 221E, 321E) ............................................................................................ 28
5.5 WHEEL HUB (21E) .............................................................................................................................. 31
5.6 WHEEL HUB (121E, 221E, 321E) ....................................................................................................... 40
5.7 WHEEL SHAFT (121E, 221E, 321E) ................................................................................................... 46
5.8 BRAKE AND WHEEL SHAFT (121E, 221E, 321E “STANDARD” and “HIGH SPEED”) ..................... 50
5.9 DIFFERENTIAL SUPPORT ................................................................................................................. 58
5.10 DIFFERENTIAL ASSY....................................................................................................................... 66
5.11 PINION............................................................................................................................................... 73
6. TROUBLESHOOTING ................................................................................................................................ 79
7. SPECIAL TOOLS........................................................................................................................................ 82
SECTION 27 - REAR AXLES
1. REMOVAL AND INSTALLATION ................................................................................................................. 1
2. DIMENSIONS ............................................................................................................................................... 3
3. TECHNICAL SPECIFICATIONS................................................................................................................... 7
4. OIL CHANGE .............................................................................................................................................. 14
5. DISASSEMBLY AND ASSEMBLY.............................................................................................................. 18
5.1 MOTOR TB150 .................................................................................................................................... 18
5.2 MOTOR TB138.5 “HIGH SPEED” ....................................................................................................... 21
5.3 TRANSMISSION BOX TB150 ............................................................................................................. 25
5.4 TRANSMISSION TB138.5 “HIGH SPEED” ......................................................................................... 34
5.5 REDUCTION GEAR (21E)................................................................................................................... 54
5.6 REDUCTION UNIT (121E, 221E, 321E).............................................................................................. 57
INDEX
5.7 WHEEL HUB (21E) .............................................................................................................................. 61
5.8 WHEEL HUB (121E, 221E, 321E) ....................................................................................................... 70
5.9 WHEEL SHAFT (121E, 221E, 321E) ................................................................................................... 76
5.10 DIFFERENTIAL SUPPORT ............................................................................................................... 80
5.11 DIFFERENTIAL ASSY ....................................................................................................................... 88
5.12 LIMITED SLIP DIFFERENTIAL ASSY ............................................................................................... 94
5.13 PINION............................................................................................................................................. 101
6. TROUBLESHOOTING .............................................................................................................................. 107
7. SPECIAL TOOLS ...................................................................................................................................... 110
SECTION 33 - BRAKE SYSTEM
1. BRAKE SYSTEM DIAGRAM ........................................................................................................................ 1
1.1 STANDARD DIAGRAM (21E) ................................................................................................................ 1
1.2 “HIGH SPEED” DIAGRAM (121E, 221E, 321E) .................................................................................... 2
2. TECHNICAL SPECIFICATIONS ................................................................................................................... 3
2.1 BRAKE PEDAL VALVE.......................................................................................................................... 3
2.2 PRESSURE SWITCHES ....................................................................................................................... 3
3. OPERATION ................................................................................................................................................. 4
3.1 SERVICE BRAKE OPERATION ............................................................................................................ 6
3.2 PARKING BRAKE OPERATION............................................................................................................ 8
4. BRAKE PEDAL VALVE................................................................................................................................. 9
5. PRESSURE SWITCHES ............................................................................................................................ 11
6. BRAKE ACCUMULATOR ........................................................................................................................... 12
6.1 TECHNICAL SPECIFICATIONS .......................................................................................................... 12
7. CHECKS AND ADJUSTMENTS ................................................................................................................. 13
7.1 SERVICE BRAKE SYSTEM PRESSURE CHECK .............................................................................. 13
7.2 ACCUMULATOR PRESSURE CHECK ............................................................................................... 14
7.3 PEDAL ANGLE ADJUSTMENT ........................................................................................................... 15
7.4 “INCHING” VALVE ADJUSTMENT ...................................................................................................... 16
8. TROUBLESHOOTING ................................................................................................................................ 17
SECTION 35 - HYDRAULIC SYSTEM
1. HYDRAULIC DIAGRAMS ............................................................................................................................. 1
1.1 HYDRAULIC DIAGRAM FOR 21E......................................................................................................... 1
1.2 HYDRAULIC DIAGRAM FOR 21E WITH OPTIONAL OUTFITS ........................................................... 3
1.3 HYDRAULIC DIAGRAM FOR 121E....................................................................................................... 5
1.4 HYDRAULIC DIAGRAM FOR 121E WITH OPTIONAL OUTFITS ......................................................... 7
1.5 HYDRAULIC DIAGRAM FOR 221E....................................................................................................... 9
1.6 HYDRAULIC DIAGRAM FOR 221E WITH OPTIONAL OUTFITS ....................................................... 11
1.7 HYDRAULIC DIAGRAM FOR 321E..................................................................................................... 13
1.8 HYDRAULIC DIAGRAM FOR 321E WITH OPTIONAL OUTFITS ....................................................... 15
2. TRANSMISSION ......................................................................................................................................... 17
2.1 HYDRAULIC DIAGRAM....................................................................................................................... 17
2.2 OPERATION ........................................................................................................................................ 18
2.3 ADJUSTMENTS................................................................................................................................... 20
3. VARIABLE-DISPLACEMENT PISTON PUMP............................................................................................ 22
3.1 TECHNICAL SPECIFICATIONS .......................................................................................................... 23
3.2 MAIN VALVES ..................................................................................................................................... 24
INDEX
3.3 DISASSEMBLY.................................................................................................................................... 32
3.4 ASSEMBLY.......................................................................................................................................... 51
4. GEAR PUMP .............................................................................................................................................. 58
4.1 TECHNICAL SPECIFICATIONS.......................................................................................................... 58
4.2 COMPONENTS ................................................................................................................................... 59
4.3 DISASSEMBLY AND ASSEMBLY....................................................................................................... 60
5. PRIORITY VALVE ...................................................................................................................................... 63
5.1 TECHNICAL SPECIFICATIONS.......................................................................................................... 63
6. TRAVEL MOTOR........................................................................................................................................ 64
6.1 TECHNICAL SPECIFICATIONS.......................................................................................................... 64
6.2 MAIN COMPONENTS ......................................................................................................................... 66
6.3 OPERATION........................................................................................................................................ 67
6.4 REMOVAL ........................................................................................................................................... 70
6.5 DISASSEMBLY AND ASSEMBLY....................................................................................................... 71
7. ONE-WAY DISTRIBUTOR VALVE ............................................................................................................. 85
8. HYDRAULIC OIL TANK .............................................................................................................................. 86
8.1 OIL FILTER.......................................................................................................................................... 87
9. TROUBLESHOOTING ................................................................................................................................ 88
SECTION 39 - FRAME
1. ARTICULATED JOINT.................................................................................................................................. 1
1.1 COMPONENTS ..................................................................................................................................... 1
1.2 DISASSEMBLY AND ASSEMBLY......................................................................................................... 2
SECTION 41 - STEERING SYSTEM
1. OPERATION ................................................................................................................................................. 1
1.1 EMERGENCY STEERING .................................................................................................................... 3
1.2 PRESSURE ADJUSTMENT .................................................................................................................. 4
2. POWER STEERING ..................................................................................................................................... 5
2.1 TECHNICAL SPECIFICATIONS............................................................................................................ 6
2.2 COMPONENTS ..................................................................................................................................... 7
2.3 DISASSEMBLY AND ASSEMBLY......................................................................................................... 8
2.4 TROUBLESHOOTING......................................................................................................................... 24
2.5 SPECIAL TOOLS................................................................................................................................. 25
3. STEERING CYLINDER .............................................................................................................................. 26
3.1 REMOVAL AND INSTALLATION ........................................................................................................ 27
3.2 DISASSEMBLY.................................................................................................................................... 29
4. TROUBLESHOOTING ................................................................................................................................ 34
SECTION 50 - HEATING AND AIR CONDITIONING SYSTEM
1. HEATING ...................................................................................................................................................... 1
2. AIR CONDITIONING .................................................................................................................................... 3
3. TROUBLESHOOTING ................................................................................................................................ 29
INDEX
SECTION 55 - ELECTRICAL SYSTEM
1. ELECTRICAL DIAGRAMS ............................................................................................................................ 1
2. FUSES AND RELAYS ................................................................................................................................ 17
3. VOLTAGE AND CONTINUITY CHECK ...................................................................................................... 20
4. BATTERY.................................................................................................................................................... 21
4.1 REPLACEMENT .................................................................................................................................. 24
5. BULBS ........................................................................................................................................................ 25
6. TROUBLESHOOTING ................................................................................................................................ 29
SECTION 82 - WORKING EQUIPMENT
1. HYDRAULIC DIAGRAM................................................................................................................................ 2
2. OPERATION ................................................................................................................................................. 3
3. REMOVAL AND INSTALLATION ................................................................................................................. 4
4. QUICK TOOL COUPLER.............................................................................................................................. 6
4.1 COMPONENTS ..................................................................................................................................... 7
4.2 QUICK TOOL COUPLER CYLINDERS ................................................................................................. 8
5. BUCKET........................................................................................................................................................ 9
5.1 ASSEMBLY............................................................................................................................................ 9
5.2 DISASSEMBLY.................................................................................................................................... 10
5.3 BUCKET TEETH - REPLACEMENT.................................................................................................... 11
6. FORKS ........................................................................................................................................................ 12
6.1 DISASSEMBLY AND ASSEMBLY ....................................................................................................... 13
6.2 CHECKS .............................................................................................................................................. 14
7. CYLINDERS................................................................................................................................................ 16
7.1 BOOM CYLINDER ............................................................................................................................... 16
7.2 DUMPING CYLINDER ......................................................................................................................... 20
8. CONTROL VALVE ...................................................................................................................................... 24
9. LOAD HOLDING VALVE ............................................................................................................................ 27
9.1 TECHNICAL SPECIFICATIONS .......................................................................................................... 27
10. TROUBLESHOOTING .............................................................................................................................. 28
1. SAFETY INSTRUCTIONS ............................................................................................................................ 1
2. GENERAL SAFETY INSTRUCTIONS .......................................................................................................... 2
3. TECHNICAL SPECIFICATIONS................................................................................................................. 12
SECTION 00 - INTRODUCTION
SECTION 00 - INTRODUCTION
SECTION 00 - INTRODUCTION 1
1. SAFETY INSTRUCTIONS
Carefully read the safety rules contained herein and
follow advised precautions to avoid potential haz-
ards and to safeguard your safety and personal in-
tegrity.
In this manual you will find the following indications:
S WARNING
This symbol warns about the possibility of potential
damages to the machine that can involve the opera-
tor’s safety.
S DANGER
With specific warnings about potential dangers for
the operator’s or other persons integrity directly or
indirectly involved.
The non compliance with the warning preceded by
the above mentioned key-words (WARNING and
DANGER) can cause serious accidents or even the
death of the persons involved.
Moreover in the present Manual have been given
some instructions with texts in italics, preceded by
the words NOTE and CAUTION, with following
meanings for machine protection:
NOTES: it emphasizes and underlines to the opera-
tor the correct technique or correct procedure to fol-
low.
S WARNING
It warns the operator of a possible hazard of machine
damage in case he does not follow a determined pro-
cedure.
Your safety and that of people around you depends
on you. It is essential that you understand this man-
ual for the correct operation, inspection, lubrication
and maintenance of this machine.
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Case 121E, 21E, 221E, 321E Service Manual
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Description
The Case 121E, 21E, 221E, 321E Compact Wheel Loaders Repair Manual is an essential resource for maintaining and repairing your Case compact wheel loaders. Whether you are a professional mechanic or a DIY enthusiast, this comprehensive workshop manual provides detailed instructions for removal, installation, disassembly, and assembly of various components.
Inside this manual, you will find clear and concise diagrams to easily navigate through the electrical wiring and hydraulic schematic diagrams, ensuring accurate repairs. Diagnostic procedures are also included, allowing you to troubleshoot and identify any issues with your compact wheel loader.
Additionally, the manual contains specifications and torque values, ensuring that every repair is done to the manufacturer's standards. It is a must-have for anyone looking to keep their machine in top-notch condition.
Models included in this manual:
- Case 121E
- Case 21E
- Case 221E
- Case 321E
