48
Two-wheel tractor 3900
Edition 04.97
5. Maintenance:
Petrol Engine
EH 25 D
1 Idling speed mix control screw
2 Idling speed limiter screw
3 Idling speed air jet
EH 25 D
Governor
spring
in hole 2
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 will render the
warranty and type approval
null and void.
Keep governor spring, lever and link-
ages free from dirt and plant trash at all
times.
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. Af-
terwards, clean with soft brush. Ex-
change the gasket and reassemble it to
the cylinder head. Tighten cylinder head
screws in turn at 22 Nm. For this pur-
pose, contact your professional agria
workshop.
Readjusting the Valve Lash
After every 400 hours of operation, re-
adjust the valve lash. Intake and outlet
valve are at 0.08–0.11mm when the en-
gine is cold. For this purpose, contact
your professional agria workshop.
Idling Speed
Always ensure that idling engine speed
is adjusted correctly.
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, re-adjust 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 cable
for no play. (For idling speeds refer to
“Specifications”).
We recommend to have the necessary
adjustments done by your agria work-
shop.
Summary of Contents for 3900
Page 5: ...Edition 04 97 Two wheel tractor 3900 5 B A Designation of Parts Petrol Engine ...
Page 9: ...Edition 04 97 Two wheel tractor 3900 9 C Designation of Parts Diesel Engine B ...
Page 44: ...44 Two wheel tractor 3900 Edition 04 97 Notes ...
Page 60: ...60 Two wheel tractor 3900 Edition 04 97 Notes ...
Page 62: ...62 Two wheel tractor 3900 Edition 04 97 D E Designation of Parts Petrol Engine ...
Page 71: ...Edition 04 97 Two wheel tractor 3900 71 Notes ...