Engine Turns But No Exhaust Smoke Comes Out (Fuel Is Not Being Injected) - Komatsu PC130-7 Shop Manual

TROUBLESHOOTING
(2) Engine turns but no exhaust smoke comes out
(Fuel is not being injected)
General causes why engine turns but no exhaust smoke
comes out
• Supply of fuel impossible
• Supply of fuel is extremely small
• Improper selection of fuel (particularly in winter)
a Standards for use of fuel
AMBIENT TEMPRATURE
KIND OF
-4
FLUID
-20
Diesel fuel
ASTM D975 No.1
Confirm recent repair history
Degree of use of machine
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 is not actuated
When fuel filter is drained, fuel does not come out
When engine is cranked with starting motor,
1) No fuel comes out even when fuel filter air bleed plug is
loosened
2) No fuel spurts out even when injection pump piping sleeve nut is
loosened
Rust and water are found when fuel tank is drained
Inspect injection pump directly
When control rack is pushed, it is found to be heavy, or does
not return
Inspect 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
Cannot be moved by hand even when linkage of fuel cut
solenoid is disconnected
PC130-7
14 32 50 68°F
-10 0 10 20°C
ASTM D975 No.2
Operated for long period
Causes
Remedy
S-2
20-609
(1)