Doosan C185 / C185WKUB-T2 — C185 Speed and Pressure Regulator Adjusting Instructions

Adjustments

For the Doosan C185 / C185WKUB-T2, from the Doosan owner's manual.

Applies to: Kubota 2403T engine

Procedure

1. On the Pressure Regulator, loosen the jam nut and turn screw counterclockwise until tension is no longer felt; then turn screw clockwise one full turn.
2. Close service valve(s).
3. Inspect throttle arm on engine governor to see the arm is resting against the governor stop; turn cylinder rod until throttle arm is against the governor stop.
4. If equipped, push the SERVICE AIR button; unit should speed up and unload; turn pressure regulator adjusting screw clockwise until discharge pressure gauge indicates 125-130 psi; tighten jam nut.
5. With the service valve closed, adjust IDLE speed using adjusting rod; tighten jam nut.
6. Open the service valve and adjust the discharge pressure to 100 psi (700 kPa); turn adjusting rod until proper engine FULL speed setting is reached; tighten jam nuts.
7. To obtain maximum CFM at any pressure between 80 psi (550 kPa) and maximum pressure rating, adjust the pressure regulator to obtain desired discharge pressure at FULL engine speed.

Source: Doosan owner's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.

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