S-8 Engine Lacks Power - Komatsu PC88MR-10 Shop Manual

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S-8 Engine lacks power

Engine lacks power.
Failure
Related
If any failure code is displayed, perform troubleshooting for that code first.
information
No.
Cause
1
Insufficient fuel in tank
Clogged air breather hole in
2
fuel tank cap
Clogged fuel filter element
3
Foreign material in fuel
4
Air in fuel piping system
5
Leakage from fuel piping
6
system
Defective supply pump
7
Clogged air cleaner element
8
9
Defective air cleaner
Defective air intake hose
10
(between air cleaner and
turbocharger inlet)
11 Defective air intake manifold
Defective boost piping and
connections
12
(between turbocharger outlet
and air intake manifold)
Defective installation of
13
charge pressure sensor
Defective exhaust gas piping
14
(from exhaust manifold to
KDOC muffler inlet)
15 Gas leakage from EGR piping
Seized or broken
16
turbocharger
PC88MR-10
(D37-A60-400-A-Z0-A)
Point to check, remarks
Fuel tank is empty.
Air breather hole in fuel tank cap is clogged.
Check used hours of fuel filter. If used
beyond specified hours, fuel filter element
may be clogged.
Rust and water are found in fuel drained
from fuel tank.
Air is bled during air bleeding of fuel system.
(Reference: See Testing and adjusting,
"Bleeding air from fuel system".)
Fuel leaks from fuel piping.
(Reference: See Testing and adjusting,
"Testing fuel circuit for leakage".)
See Testing and adjusting, "Testing fuel
discharge, return and leakage".
Air cleaner dust indicator indicates that dust
is at caution level.
Check air cleaner and rectifying wire net for
deformation.
Visually check air intake hose for breakage. Replace air intake
Check air intake manifold for internal
breakage.
Air leaks from boost piping.
Air leaks from mounting part of charge
pressure sensor.
Check exhaust gas piping for damage and
exhaust gas leakage.
(Check soot on heat insulation cover and
heat insulation plate.)
Gas leaks from EGR piping.
Unusual noise is heard from turbocharger.
Check whether turbocharger shaft rotates.
(Move turbocharger vanes with hand in axial
and radial directions to make judgment.)
40 Troubleshooting
Troubleshooting of engine (S-mode)
Remedy
Add fuel.
Flush air breather hole
in fuel tank cap and
clean surrounding
area.
Replace fuel filter
element.
Replace fuel.
Perform air bleeding.
Repair or replace fuel
piping.
Repair or replace fuel
piping related parts.
Replace supply pump
or pressure limiter.
Check and clean air
cleaner element.
Correct or replace air
cleaner.
hose.
Replace air intake
manifold.
Correct or replace
boost piping.
Correct installation of
charge pressure
sensor.
Replace exhaust gas
piping.
Replace EGR piping.
Replace turbocharger.
40-525

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