Case 1021G, 1121G Touchscreen Wheel Loader Service Manual

These 1021G and 1121G loaders live in nasty conditions—quarries, feed yards, transfer stations—where the touchscreen, drivetrain, and hydraulics get worked hard every shift. This service manual is what I’d pull out when the touchscreen quits talking to the machine, the loader won’t move out of the yard, or an operator says the gauges “went crazy” after a battery swap. It walks you through a logical process so you can trace a fault, test the right circuits, and then strip down and reassemble components without guessing.

Applications & Use Cases

• Chasing touchscreen faults when the display freezes, won’t boot, or stops showing engine/transmission data.
• Verifying sensor and wiring issues before you throw parts at warning lights or erratic readings.
• Guiding safe disassembly and reassembly of engine, transmission, and axle components around the electronic controls.
• Setting up and adjusting controls after replacing a touchscreen, harness, or control module.
• Supporting scheduled maintenance with proper inspection points and post-repair tests.

FAQ

Q: Can I use this on a laptop or tablet in the field?

A: Yes, it’s well suited for a laptop or rugged tablet so you can scroll and zoom diagrams right beside the machine.

Q: Is it worth printing sections of this manual?

A: I often print the pages for the system I’m working on and keep them at the bench so they don’t get wrecked by grease and dust.

Safety Note

Always lock out, block, and depressurize the loader before you start any diagnostics or teardown guided by this manual.

Case 1021G, 1121G Touchscreen Wheel Loader Index:

Contents
INTRODUCTION
Engine – 10
Transmission – 21
Four-Wheel Drive (4WD) system – 23
Front axle system – 25
Rear axle system – 27
Brakes and controls – 33
Hydraulic systems – 35
Frames and ballasting – 39
Steering – 41
Wheels – 44
Cab climate control – 50
Electrical systems – 55
Lubrication system – 71
Front loader and bucket – 82
Platform, cab, bodywork, and decals – 90
SPECIAL TOOL INDEX

CNH