“You check the hydrostatic drive relief valve?” she asked.

Diagnostic matrices for mechanical, hydraulic, and electrical failures. 2. Engine and Powertrain Diagnostics

The manual directs the technician to check the mechanical bypass valve first.

Bomag releases technical bulletins (TIBs) annually. If you buy a digital manual, check your dealer portal for “service news” updates to the hydraulic schematic or engine calibration.

“It says here,” Marisol muttered, tracing a line with her finger, “that if the pressure at port M3 drops below 210 bar, the proportional solenoid valve de-energizes and locks the vibration circuit.”

Check the electrical current arriving at the vibration activation solenoid.

Hydrostatic drive with dual amplitude vibration. Steering: Oscillating articulated steering joint.

Bomag offers some YouTube maintenance videos, but they are generic. The full service manual contains proprietary dimensional drawings that no video includes.

If you need help diagnosing a specific issue with your machine, please tell me:

The manual includes large, color-coded schematic flowcharts. These diagrams track the path of hydraulic oil from the reservoir, through the suction filters, into the main pumps, past the control valve blocks, and finally to the drive and vibration motors. Learning to read these diagrams allows a technician to isolate a failure to a single valve or loop. Pressure Testing and Adjustments