Hitachi UH121 Excavator Service Manual PDF

The service manual contains detailed service and repair information, special instructions for repair and maintenance, schematics and diagrams, troubleshooting, and other additional information for the Hitachi excavator UH121.
This manual comes in PDF format, includes 194+354 pages, all pages are printable and readable. We recommend using Adobe PDF Reader to be sure all images/graphics will display correctly.

CONTENTS:
UH121 SPECIFICATIONS

UH121 OPERATIONAL PRINCIPLE
1. GENERAL (Machine Serial No. - 1129)
2. GENERAL (Machine Serial No. 1129 -)
3. ASSIST VALVE
4. BRAKE VALVE
5. CYLINDER
6. FULL-FLOW FILTER
7. HM MOTER
8. HPV125 AXIAL PISTON PUMP
9. IP GEAR PUMP
10. MPV25 CONTROL VALVE
11. KVC PLUNGER PUMP
12. PREFERENCE VALVE
13. REGULATOR
14. RM75A REGULATOR
15. SLOW RETURN VALVE
16. SX MOTOR
17. SWING REDUCTION DEVICE

UH121 DISASSEMBLY AND ASSEMBLY
1. BRAKE VALVE
2. CYLINDER
3. HM MOTOR
4. HPV125 AXIAL PISTON PUMP (Serial No. 1129-)
5. IP GEAR PUMP
6. MVP CONTROL VALVE
7. KVC PLUNGER PUMP (Serial No. 001-1128)
8. TRAVEL DEVICE
9. REGULATOR (Serial No. 001-1128)
10. RM75A REGULATOR (Serial No. 1129-)
11. SX MOTOR
12. SWING REDUCTION DEVICE
13. HOW TO DISASSEMBLE/ASSEMBLE HYDRAULIC EQUIPMENT
14. CONVERSION TABLE

UH121 MAINTENANCE STANDARD
1. STANDARD
2. CYLINDER
3. HM MOTOR
4. SX MOTOR