Engine Does Not Crank; Engine Cranks But Will Not Start - Husqvarna Z400 Series Service Manual

REPAIR

Engine Does Not Crank

Diagnostic Checks
Are control levers in
the neutral or parking
brake position?
Is power take-off (PTO)
switch disengaged?
Is battery connection
clean and tight?
Is battery fully
charged?
Is key switch working
correctly? See "Key
Switch Test" on
page 6-21.
Is seat switch working
correctly? See "Seat
Switch Test" on
page 6-22.
Is starter motor
working correctly? See
"Starter Motor Solenoid
Test" on page 6-27.
Results
YES: Go to next check.
NO: Place control
levers in the
neutral or parking
brake position.
YES: Go to next check.
NO: Disengage PTO
switch.
YES: Go to next check.
NO: Clean and tighten
battery
connections. See
"Remove and
Install Battery" on
page 5-15.
YES: Go to next check.
NO: Charge battery.
See "Battery,
Charging, and
Starting Systems
Tests" on
page 6-16.
YES: Go to next check.
NO: Repair or replace
key switch as
necessary.
YES: Go to next check.
NO: Repair or replace
seat switch as
necessary.
YES: Checks complete.
NO: Repair or replace
solenoid as
necessary.

Engine Cranks But Will Not Start

Diagnostic Checks
Are gasoline and oil at
the correct level?
Is fuel shutoff valve in
the open position?
Is key switch working
correctly? See "Key
Switch Test" on
page 6-21.
Is spark plug
functioning properly?
See "Spark Test" on
page 6-19.
Is spark plug gap to
specification?
Is spark plug seated
correctly?
Is ignition coil
functioning properly?
Does engine have
compression?
Are valves adjusted
properly? See
authorized engine
dealer for specification.
5-18
Results
YES: Go to next check.
NO: Fill gasoline and
oil to correct
levels. See
"Machine
Specifications" on
page 2-4.
YES: Go to next check.
NO: Open fuel shutoff
valve.
YES: Go to next check.
NO: Repair or replace
key switch as
necessary.
YES: Go to next check.
NO: Replace spark
plug as necessary.
YES: Go to next check.
NO: Adjust spark plug
gap to 0.03 in
(0.76 mm).
YES: Go to next check.
NO: Tighten spark plug
to 192 lb-in (22
N•m).
YES: Go to next check.
NO: See authorized
Husqvarna dealer
for assistance.
YES: Go to next check.
NO: See authorized
Husqvarna dealer
for assistance.
YES: Checks complete.
NO: See authorized
Husqvarna dealer
for assistance.
Z400 Series