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42
agria
Power Mower 5400
5
5. Maintenance: 4-stroke engine
EH 25 D
1 Idling speed mix control screw
2 Throttle stop screw
3 Idling speed air jet
EH 25 D
Governor
spring in
hole 3
Cleaning the Cylinder Head
After every 400 hours of operation take
off cylinder head and remove carbon
deposits on the cylinder head, piston
crown and valves with a steel brush.
Afterwards, clean with soft brush. Ex-
change the gasket and reassemble it to
the cylinder head. Tighten cylinder head
screws in turn at 25 Nm.
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Service
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Readjusting the Valve Lash
After every 400 hours of operation, re-
adjust the valve lash. Intake and outlet
valve are at 0.08–0.11 mm when the
engine is cold.
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Service
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Cleaning the carburettor
Clean the carburettor every 400 opera-
tion hours and then readjust the idle
speed.
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Service
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Idle speed adjusting
Always ensure that idling-speed is ad-
justed correctly. With the speed control
lever set to idle, the engine is supposed
to run smoothly and without run-out at
low engine speed.
At low speeds, the engine is supposed
to continue running smoothly when the
speed control lever is at a stop in idling.
Adjust the engine speed while the en-
gine is still warm from operation. For this
purpose, readjust the limiter screw (2)
and the mix control screw (1) for idling
speed. Then turn the attachment or ad-
justing screw to adjust the throttle ca-
ble for no play. (For idling speeds refer
to “Specifications”).
Adjustment
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Service
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Governor
For proper function of the engine speed
governor and to adjust the upper idling
speed, the governor spring has to be in
the appropriate hole, see fig.
W
Any changes to the position of
the spring increases the risk of
accident and will render the warranty
and type approval null and void!
Keep governor spring, lever and linkages
free from dirt and plant trash at all times.
EH 17 D
EH 17 D
Governor
spring in
hole 2
5
5
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