Doosan 7/53, Operation And Maintenance Manual

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MAINTENANCE 27
7/53
SPEED AND PRESSURE REGULATION ADJUSTMENT
Normally, regulation requires no adjusting, but if correct adjustment is
lost, proceed as follows:
Refer to the diagram above.
A: Throttle arm
B: Adjusting knob
Start the machine (Refer to STARTING INSTRUCTIONS in the
OPERATING INSTRUCTIONS section of this manual).
Inspect the throttle arm on the engine governor to see that it is
extended in the full speed position when the engine is running at full-
load speed and the service valve is fully open. (Refer to the
GENERAL
INFORMATION section of this manual).
Adjust the service valve on the outside of the machine to maintain 7 bar
without the throttle arm moving from the full speed position. If the
throttle arm moves away from the full speed position before 7 bar is
attained, then turn the adjusting screw clockwise to increase the
pressure. Optimum adjustment is achieved when the throttle arm just
moves from its full speed position and the pressure gauge reads 7,2
bar.
Close the service valve. The engine will slow to idle speed.
CAUTION: Never allow the idle pressure to exeed 8,6bar on the
pressure gauge, otherwise the safety valve will operate.