Troubleshooting; Engine Faults - Zetor PRIMO HT 20 NC Operator's Manual

Engine Faults

FAULT
The starter
does not run
even when
the main
switch is
turned
The starter is
Engine running, the
rotation speed
cannot be
increased
The starter is
running, but
the engine
cannot be
started
The engine
runs
irregularly

TROUBLESHOOTING

PROBABLE CAUSE
PTO switch set to ON position

Defective safety switch

Dead battery

Loose cable

Defective switch

Defective starter

Low battery

Poor grounding

Incorrect engine oil viscosity

Air in the fuel system

Clogged fuel filter

No fuel supply

Defective engine

Defective key shutdown unit

Air in the fuel system

Clogged fuel filter

SOLUTION
Set the PTO switch to OFF

position
Have it repaired by an authorized

service
Charge the battery

Check for looseness and

corrosion. Clean, tighten and
apply grease
Have it repaired by an authorized

service
Have it repaired by an authorized

service
Charge the battery

Clean the contact and ground

properly
Replace with engine oil of the

correct viscosity
Bleed the system

Clean or replace the filter

Open the fuel supply

Have it repaired by an authorized

service
Have it repaired by an authorized

service
Bleed the system

Clean or replace the filter

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