Komatsu 95-2 Series User Manual

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95-2 SERIES
TROUBLESHOOTING S-2
(2) Engine turns but no exhaust smoke comes
out (fuel is not being injected)
General causes why engine turns but no ex-
haust smoke comes out
• Supply of fuel impossible
• Supply of fuel is extremely small
• Improper selection of fuel (particularly in win-
ter)
fl Standards for use of fuel
ASTM D975 No.1
Ambient temprature
Type of fuel
–22 –4 14 32 50 68 86 104°F
–30 –20 –10 0 10 20 30 40°C
Diesel fuel
ASTM D975 No.2
Confirm recent repair history
Degree of use Operated for long period
Exhaust smoke suddenly stops coming out (when starting again)
Replacement of filters has not been carried out according to
operation manual
Fuel tank is found to be empty
There is leakage from fuel piping
Mud is stuck to fuel tank cap
When starting switch is turned ON, linkage does not move
When fuel filter is drained, fuel does not come out
When engine is cranked with starting motor,
1) Fuel injection pump coupling does not rotate
2)
No fuel comes out even when fuel filter air bleed plug is loosened
3) No fuel spurts out even when fuel injection pipe sleeve nut is loosened
Rust and water are found when fuel tank is drained
Broken fuel injection pump drive shaft, key
Defective fuel injection pump (rack, plunger seized) Seized, broken feed pump piston
Clogged fuel filter, strainer
Clogged feed pump strainer
Lack of fuel
Clogged, leaking fuel piping
Clogged fuel tank air breather hole
Defective fuel cut solenoid
Defective engine stop motor
Improper fuel used
Questions
Check fuel injection pump directly
When control rack is pushed, it is found to be heavy, or does not return
Check feed pump directly
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 fuel cap is inspected directly, it is found to be clogged
Does not move even when fuel cut solenoid linkage is disconnected
Does not move even when engine stop motor linkage is disconnected
Troubleshooting Check items
Causes
Remedy
Replace Replace Replace Clean Clean Add Repair Repair Replace Replace 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.
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Komatsu 95-2 Series Specifications

General

Brand	Komatsu
Model	95-2 Series
Category	Engine
Language	English