Left side blocked, what to do?

The most likely fault is a seized or mechanically locked left final drive, followed by a failed travel clutch, brake, or drive motor. Do not keep forcing it with the right track, because that can damage the transmission or final-drive gears.

First checks

1. Check for a physical bind. Park on firm ground, shut down, release the travel controls, and inspect the left sprocket, rollers, idler, and track chain for packed material, a thrown track, broken tooth, or a roller that has seized. Compare whether the left track can be moved slightly with the machine safely blocked and supported. Never work under a machine held only by hydraulics.

2. Check the left drive oil. Drain or sample the final-drive oil. Large steel particles, bronze material, or a burnt smell points to failed bearings, gears, or clutch components. No oil or a very low level also makes final-drive damage likely.

3. Check hydraulic delivery. With the track safely lifted and restrained, operate the left travel control briefly at low idle. A travel motor that loads the engine, makes noise, and produces hose vibration but does not turn suggests a locked final drive or seized motor. Little or no pressure suggests a control valve, pilot circuit, blocked hose, or failed pump section. A field diagnostic discussion uses hose vibration and motor sound as initial clues, but pressure testing is the proper confirmation.

4. Compare sides. Measure left and right travel pressure at the motor ports, using the Hanomag manual's test procedure. If pressure is similar on both sides, the fault is downstream in the left motor, brake, clutch, or final drive. If left pressure is low, trace the valve, pilot signal, and hose circuit first.

Add the exact 700 D serial number and whether the left track is locked solid or rolls freely for a sharper diagnosis.