Zetor PRIMO HT 20 NC, Operator'S Manual

Page: 120 / 134

Engine Faults
FAULT PROBABLE CAUSE SOLUTION
Engine
The starter
does not run
even when
the main
switch is
turned

PTO switch set to ON position

Set the PTO switch to OFF
position

Defective safety switch

Have it repaired by an authorized
service

Dead battery

Charge the battery

Loose cable

Check for looseness and
corrosion. Clean, tighten and
apply grease

Defective switch

Have it repaired by an authorized
service

Defective starter

Have it repaired by an authorized
service
The starter is
running, the
rotation speed
cannot be
increased

Low battery

Charge the battery

Poor grounding

Clean the contact and ground
properly

Incorrect engine oil viscosity

Replace with engine oil of the
correct viscosity
The starter is
running, but
the engine
cannot be
started

Air in the fuel system

Bleed the system

Clogged fuel filter

Clean or replace the filter

No fuel supply

Open the fuel supply

Defective engine

Have it repaired by an authorized
service

Defective key shutdown unit

Have it repaired by an authorized
service
The engine
runs
irregularly

Air in the fuel system

Bleed the system

Clogged fuel filter

Clean or replace the filter
TROUBLESHOOTING
119