Bobcat 741 - Page 279

TROUBLESHOOTING
Chart
The following troubleshooting chart is provided for assistance in locating and correcting problems which are most common.
Many of the recommended procedures must be done by authorized Bobcat Service Personnel only.
PROBLEM
CAUSE
Slow cranking speed.
1,2,3,4
Engine will not start.
2,3,4,5,6,7,8,9,10,11,12
Rough idle.
9, 13, 14, 15, 16
Abnormal combustion.
9,11,14,17,18,19,20,21
Engine noise.
8,14,22,23,24,25,26,27,28,29
Acceleration insufficient. 5,9,11,31,32
Power insufficient.
5,8,9,11,12,13,14,15,17,18,21,26,31,33,34
Too much fuel consumption. 8,9,11,12,13,14,15,16,18,26,32
Too much engine oil.
consumption.
26,35,36,37,38,39,40,41,42,43,44,45
Excessive engine vibration. 9,11,17,31,34,45,46
Overheating. 9,11,13,20,30,47,48,49,50
High Oil Pressure.
4,51,52
KEY TO CORRECT THE CAUSE
1.
Battery capacity low.
2.
Bad electrical connections.
3. Faulty starter motor.
4.
Incorrect grade of oil.
5. Burnt valve.
6. Intake manifold gasket leaking.
7. Carburetor mounting loose.
8. Piston, rings & cylinder worn.
9. Cylinder head gasket leaking.
10.
Faulty electrical wiring.
11.
Faulty ignition system.
12.
Fuel system problem.
13.
Restriction in the air cleaner.
14.
Valve clearance not correct.
15.
Wom valves and seats.
16 .
Worn valve stems or guides.
17.
Vale stuck.
18.
Weak valve springs.
19.
Carbon accumulated in combustion
chamber.
20.
Restriction in the water jacket
21.
Carburetor mixture too lean.
22.
Worn or damaged bearings.
23.
Connecting rod bent.
24.
Piston or piston pin wom.
25. Burnt piston.
26.
Piston rings damaged.
Added Sept. 90
27.
28.
29.
30.
31.
32.
33.
34.
35.
36.
37.
38.
39.
40.
41.
42.
43.
44.
45.
46.
47.
48.
49.
50.
51.
52.
-70-1-
Excessive camshaft end play.
Crankshaft thrust bearing worn.
Timing belt wom.
Water pump
or fan belt faulty.
Poor compression.
Carburetor accelerator pump faulty.
Overheating.
Cold running.
Oil pan drain plug is loose.
Oil pan bolts are loose.
Oil pan gasket is faulty.
Timing gear cover is loose or gasket
is broken.
Crankshaft front seal leaking.
Crankshaft rear seal leaking.
Valve cover gasket is leaking.
Fuel pump loose
or faulty gasket.
Oil filter mounting loose.
Plugged
oil return hole.
Piston rings stuck.
Faulty engine mounting.
Exhaust pipe restriction.
Faulty thermostat.
Plugged radiator.
Coolant level low.
Switch is defective.
Pressure relief sticking closed.
741, 742, 743, 7430S Bobcat Loader
Service Manual