Kubota DF972-E2, Workshop Manual, Page: 72 / 138

S-2
WG972-E2, DF972-E2, WSM GASOLINE / LPG ENGINE
W1060742
[2] FOR LPG FUEL
W1014322
Symptom Probable Cause Solution
Reference
Page
Engine Speed Does
Not Increase Incorrect governor adjustment Adjust S-20
Defective ignitor Replace S-26
Incorrect carburetor adjustment Adjust S-20
Clogged air cleaner Clean or replace G-16
Defection Output Improper intake or exhaust valve sealing Replace S-52
Incorrect governor adjustment Adjust S-20
Excessive carbon in engine Remove carbon –
Improper valve clearance Adjust S-16
Piston ring and cylinder worn Replace S-64
Clogged air cleaner Clean or replace G-16
Engine Noise Improper valve clearance Adjust S-16
Spark knock due to low-octane fuel or carbon Use higher-octane
fuel and remove
carbon –
Rattles from loosely mounted external
components Retighten –
Symptom Probable Cause Solution
Reference
Page
Engine Turns Over at
Normal Speed but
Does Not Start No LPG fuel Replenish LPG fuel
Check of taking valve
of LPG tank
Check of shut off
valve –
Vacuum lock system is defective Check of vacuum
hose
Replace of vaporizer S-23
Mistake of throttle lever position Set the throttle lever
to the low idle
position S-20
Rough Low-Speed
Running and Idling Lack of amount of gas supply Replenish LPG fuel
Check of shut off
valve –
Idling is defective Replace of vaporizer
Draining the tar from
vaporizer G-20
Defection Output Density of the LPG is rich Replace of vaporizer –
LPG shortage Repair or replace of
fuel system
Replace of vaporizer –
KiSC issued 01, 2006 A