Komatsu 95-2 Series User Manual

12-110 95-2 SERIES
TROUBLESHOOTING S-2
(3) Exhaust smoke comes out but engine does
not start
(Fuel is being injected)
fl General causes why exhaust smoke comes
out but engine does not start
• Lack of rotating force due to defective elec-
trical system
• Insufficient supply of fuel
• Insufficient intake of air
• Improper selection of fuel and oil
Confirm recent repair history
Degree of use of machine Operated for long period
Suddenly failed to start
When engine is cranked, abnormal noise is heard from around cylinder head
Engine oil must be added more frequently
Non-specified fuel is being used
Replacement of filters has not been carried out according
to Operation Manual
Rust and water are found when fuel tank is drained
Dust indicator is red
Indicator lamp does not light up
Starting motor cranks engine slowly
Mud is stuck to fuel tank cap
When fuel lever is placed at FULL position, it does not contact stopper
When engine is cranked with starting motor,
1) Little fuel comes out even when fuel injection pipe
sleeve nut is loosened
2) Little fuel comes out even when fuel filter air bleed
plug is loosened
There is leakage from fuel piping
When exhaust manifold is touched immediately after
starting engine, temperature of some cylinders is low
When fuel filter is drained, no fuel comes out
Defective, broken valve system (valve, rocker lever, etc.)
Defective fuel injection pump (rack, plunger stuck)
Worn piston ring, cylinder liner
Clogged fuel filter, strainer
Clogged feed pump strainer
Clogged air cleaner element
Electrical intake air heater
Glow plug
Defective or deteriorated battery
Leakage, clogging, air in fuel system
Clogged fuel injection nozzle, defective spray
Clogged air breather hole in fuel tank cap
Improper fuel used
QuestionsCheck items
Remove head cover and check directly
When control rack is pushed, it is found to be heavy, or does not return
When compression pressure is measured, it is found to be low
When fuel filter, strainer are inspected directly, they are found to be clogged
When feed pump strainer is inspected directly, it is found to be clogged
When air cleaner element is inspected directly, it is found to be clogged
Glow plug mount does not become warm
Either specific gravity of electrolyte or voltage of battery is low
When feed pump is operated, operation is too light or too heavy
Speed does not change when operation of certain cylinders is stopped
When fuel cap is inspected directly, it is found to be clogged
Troubleshooting
Remedy
Causes
Replace Replace Replace Clean Clean Clean Replace Replace Replace Correct Clean Clean Replace
Legend
: Possible causes (judging from Questions and check items)
: Most probable causes (judging from Questions and Check items)
: Possible causes due to length of use (used for a long period)
: Items to confirm the cause.
Auxiliary
starting system
12-110
1

Komatsu 95-2 Series Specifications

General

Brand	Komatsu
Model	95-2 Series
Category	Engine
Language	English