Loader Bobcat 853, 853H. Manual - part 54

  1. Battery capacity low.

28. Worn valve and seats.

  2. Bad electrical connections.

29. Broken, worn or sticking piston rings.

  3. Faulty starter motor.

30. Worn valve stems or guides.

  4. Incorrect grade of oil.

31. Worn or damaged bearings.

  5. Low cranking speed.

32. Not enough oil in the oil pan.

  6. Fuel tank empty.

33. Switch/sensor is defective.

  7. Faulty stop control operation.

34. Oil pump worn.

  8. Plugged fuel line.

35. Pressure relief valve is sticking open.

  9. Plugged fuel filter.

36. Pressure relief valve is sticking closed.

10. Restriction in the air cleaner.

37. Broken relief valve spring.

11.

Air in the fuel system.

38. Faulty suction pipe.

12. Faulty fuel injection pump.

39. Plugged oil filter.

13. Faulty fuel injectors.

40. Piston seizure.

14. Broken injection pump drive.

41. Incorrect piston height.

15. Incorrect injection pump timing.

42. Faulty engine mounting.

16. Incorrect valve timing.

43. Incorrect alignment of flywheel.

17. Poor compression.

44. Faulty thermostat.

18. Plugged fuel tank vent.

45. Restriction in water jacket.

19. Incorrect grade of fuel.

46. Loose alternator belt.

20. Exhaust pipe restriction.

47. Plugged radiator.

21. Cylinder head gasket leaking.

48. Faulty water pump.

22. Overheating.

49. Plugged breather pipe.

23. Cold running.

50. Damaged valve stem oil deflectors.

24. Incorrect tappet adjustment.

51. Coolant level too low.

25. Sticking valves.

52. Plugged oil pump pipe strainer.

26. Incorrect high pressure fuel pipes.

53. Broken valve spring.

27. Worn cylinder bores.

Slow cranking speed.

1, 2, 3, 4

Engine will not start.

2, 5, 6, 7, 8, 9, 11, 12, 13, 14, 15, 16, 17, 19, 27, 28, 29

Difficult to start.

5, 7, 8, 9, 10, 11, 12, 13, 15, 16, 17, 18, 19, 20, 25, 27, 28, 29

No power for engine.

8, 9, 10, 11, 12, 13, 15, 16, 17, 18, 20, 21, 22, 23, 27, 28, 29

Engine is mis–firing.

8, 9, 11, 12, 13, 15, 16, 17, 21, 22, 24, 25, 26, 28

Too much fuel consumption.

10, 12, 13, 15, 16, 17, 19, 20, 21, 23, 24, 25, 27, 28, 29

Black exhaust.

10, 12, 13, 15, 16, 17, 19, 20, 21, 23, 24, 25, 27, 28, 29

Blue/white exhaust.

4, 10, 15, 16, 17, 21, 23, 27, 29, 30, 50

Low oil pressure.

4, 31, 32, 33, 34, 35, 37, 39, 52

Engine knocking.

13, 15, 16, 19, 22, 24, 25, 27, 29, 31, 40, 41, 53

Engine running rough.

7, 8, 9, 10, 11, 12, 13, 17, 18, 22, 24, 25, 26, 29, 40, 53

Vibration.

12, 13, 17, 21, 22, 25, 26, 29, 40, 42, 43

High oil pressure warning.

4, 33, 36

Overheating.

10, 12, 13, 15, 16, 20, 21, 40, 44, 45, 46, 47, 48, 51

Too much crankcase pressure. 22, 27, 29, 30, 40, 49
Poor compression.

10, 16, 21, 24, 25, 27, 28, 29, 30, 41, 53

Start and stop.

9, 10, 11

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

KEY TO CORRECT THE CAUSE

853, 853H Loader

–7–5–

Service Manual

ENGINE SPEED CONTROL

Removal And Installation

Raise the operator cab. (See Page 1–1.)

Remove the two mounting bolts (Item 1) [A] and nuts from
the speed control mounting bracket.

Installation: Tighten the bolts (Item 2) [A] evenly until the
speed control lever moves back and forth at a
comfortable tension.

Pull the speed control away from the loader frame and
disconnect the speed control rod (Item 1) [B] from the
control.

Installation:  Be sure to install the control rod in the
bottom hole of the speed control.

Installation: Install the stop bracket (Item 1) [C] in the
same location. It is necessary for the front and rear stop
on the bracket to be located correctly.

Reverse the removal procedure to install the engine
speed control.

Loosen the two control lever mounting bolts and remove
the mounting nuts (Item 2) [C].

Do not lubricate the engine speed control.

Replace any worn or damaged parts if necessary.

A

P–09326

1

1

2

C

P–04068

1

2

–7–6–

853, 853H Loader

Service Manual

B

P–09327

1

ENGINE MUFFLER

Removal And Installation

Open the rear door.

Raise the rear grill.

Remove the air cleaner. (See Page 7–8.)

Loosen the exhaust pipe clamp (Item 1) [A].

Disconnect the exhaust pipe from the muffler.

Remove the mounting bolt (Item 1) [B] from the muffler
(both sides).

Remove the muffler from the loader.

A

P–04892

1

853, 853H Loader

–7–7–

Service Manual

B

P–04888

1

AIR CLEANER HOUSING

Removal And Installation

Loosen the hose clamp (Item 1) [A].

Disconnect the hose from the intake manifold.

Loosen the hose clamp (Item 1) [B].

Disconnect the intake hose from the air cleaner housing.

NOTE: The manual indicator (Item 1) [C] is equipped

on the 853 standard loader only.

Remove the two mounting bolts (Item 2) [C] (at the top)
and one mounting bolt at the bottom of the housing.

Remove the air cleaner housing.

NOTE: Disconnect the wires (Item 1) [D] from the

sensor at the rear of the air cleaner housing.
The sensor is equipped on 853 BOSS

®

option loaders only.

A

P–04889

1

C

P–04891

1

2

D

P–05194

BOSS

®

1

–7–8–

853, 853H Loader

Service Manual

B

P–04890

1