7835-26-2002 7835-26-2003 Pump Controller for Komatsu Excavator PC300-7 PC360-7 PC400-7

Common Symptoms That May Require Pump Controller Inspection

Weak hydraulic response: boom, arm, bucket, swing or travel functions respond slowly or inconsistently.

Pump control issues: hydraulic pump output may not match operating mode, load demand or machine command.

Mode control problems: work modes, power modes or hydraulic output settings may not respond as expected.

Communication faults: monitor display or system communication may become unstable when the controller, harness or connector has an issue.

No power or unstable signal: fuse, power supply, ground or wiring harness faults can imitate controller failure.

Fitment Check Before Ordering

Before ordering this Komatsu 7835-26-2002 / 7835-26-2003 pump controller, compare it with your original controller. Important confirmation points include the controller label, part number, connector quantity, connector shape, pin layout, mounting position and software version.

For faster confirmation, please send clear photos of the original controller label, front housing, rear connector side, plug layout and machine model plate. This helps reduce wrong orders and confirms whether the controller matches your Komatsu Dash-7 excavator configuration.

Installation and Maintenance Notes

Disconnect machine power before removing or installing the pump controller.

Do not pull directly on the wiring harness. Release connector locks before unplugging.

Inspect all connectors for bent pins, corrosion, water ingress and loose terminals.

Check fuse, power supply, ground and harness continuity before replacing the controller.

After installation, check monitor display, machine start-up, work mode response, hydraulic pump response and fault-code status before returning the machine to work.

Ordering Information

Topvelsun supplies controllers, ECUs, MCUs, pump controllers, monitor panels, sensors, wiring harnesses and electrical components for Komatsu, Caterpillar, Hitachi, Hyundai, Kobelco, Volvo and other heavy equipment brands. For this 7835-26-2002 / 7835-26-2003 pump controller, please provide your machine model, serial number, original part number and connector photos before quotation.

FAQ

What is 7835-26-2002 / 7835-26-2003 used for?

7835-26-2002 / 7835-26-2003 is listed as a pump controller reference for Komatsu excavator hydraulic pump control applications. Final fitment should be verified by the original controller label and connector layout.

Can this controller be confirmed by machine model only?

No. Pump controllers may vary by machine serial number, software version, connector layout and hydraulic pump configuration. Photos of the original controller are recommended before ordering.

Are 7835-26-2002 and 7835-26-2003 interchangeable?

Do not assume interchangeability by part number series alone. Please verify the original controller label, connector layout, software version and machine serial number before selecting a replacement.

What photos should I send for confirmation?

Please send photos of the original controller label, front and rear housing, all connectors, pin layout, mounting position and machine model plate.