Edition 04.97
Two-wheel tractor 3900
57
6. Troubleshooting
W
Observe safety instructions! Have all serious malfunctions on the machine or engine repaired
by your agria workshop. They have the proper tools. Improper repairs can only add to the damage.
Problem
Possible cause
Remedy
Page
Petrol engine
- Spark plug connector not connected
Connect spark plug connector
does not start
- Choke is not pulled
Set Choke-lever to
operating position “BETRIEB”
38
- Engine-off-switch is set to “0”
Set engine-off-switch to “I”
38
- Safety circuit is not set to start position
Set safety circuit to start position
23
- Fuel tank empty or poor fuel
Fill fresh fuel
- Fuel line clogged
Clean fuel line
47
- Defective spark plug
Clean, adjust or exchange spark plug
47
- Engine too much fuel
Dry and adjust spark plug and
(“flooded engine”)
start at full throttle
47
- Engine-off-line defective
Check line and connections
¬
54
- Inleaked air due to loose caburetor
Tighten fastening screws
and suction line
Misfirings in
- Engine running in CHOKE range
Set CHOKE-lever to
petrol engine
operating position “BETRIEB”
38
Fix ignition cable retaining device
- Clogged fuel line or poor fuel
Clean fuel line,fill fresh fuel
¬
- Vent opening in fuel tank cap clogged
Exchange fuel tank cap
- Water or dirt in fuel system
Drain fuel and fill fresh fuel
- Air filter clogged
Clean air filter or exchange
46
- Carburetor misadjusted
Re-adjust carburetor
¬
48
Excessive
- Low engine oil level
Refill oil immediately
45
temperature
- Impaired cooling
Clean cooling fan grille,
in petrol engine
clean internal cooling fins
46
- Air filter clogged
Clean air filter
46
- Carburetor misadjusted
Re-adjust carburetor
¬
48
Misfirings in
- Short firing intervals
Adjust spark plug
47
petrol engine
- Incorrect idle mix
Adjust carburetor
¬
48
at high speeds
Petrol engine
- Firing interval too long,
Adjust or replace spark plug
47
frequently
defective spark plug
stalls
- Carburetor misadjusted
Re-adjust carburetor
¬
48
in idle
- Air filter clogged
Clean air filter
46
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 ...