INSTRUCTION, USE AND
MAINTENANCE MANUAL
GB
Page 34 of 68
7503-M002-6_B
NAV26HW - NAV26HW.S - NAV26HW.ST
14.0 TROUBLESHOOTING TABLE
Possible troubles which might occur to the tyre-changer are listed below. The manufacturer disclaims all
responsibility for damages to people, animals or objects due to improper operation by non-unauthorised
personnel. In case of trouble, call Technical Service Department for instructions on how to service and/or
adjust the machine in full safety to avoid any risk of damage to people, animals or objects.
In an emergency and before maintenance on tyre-changer, set the main switch to “0” and lock it in this position.
CONTACT AUTHORIZED TECHNICAL SERVICE
do not try and service alone
Problem
Possible cause
Remedy
Pump motor does not work but
wheel holder mandrel motor
works perfectly.
a)
Hydraulic control unit damaged.
a)
Call Technical Service
Dept.
When main switch is turned on,
wheel holder mandrel does not
turn whereas the pump motor
works.
a)
Gearbox change-over switch
damaged.
a)
Call Technical Service
Dept.
Power drop during wheel holder
mandrel rotation.
a)
Timing belt too loose.
a)
Tension up the belt.
No pressure in the hydraulic sys-
tem.
a)
Pump damaged.
a)
Replace pump.
The mandrel opening pressure
does not go down (NAV26HW -
NAV26HW.S).
a)
Pressure limiting valve jammed.
a)
Download mandrel
(remove wheel), com-
pletely undo adjusting
handle. Perform many
opening and closing
cycles until jam re-
lease.
The machine does not start.
a)
No electricity supply.
b)
Overload cutouts not set.
c)
Transformer fuse blown.
a)
Connect the electricity supply.
b)
Set the overload cutouts.
c)
Change the fuse.
Fluid leaks from union or pipe-
line.
a)
Union not tightened correctly.
b)
Pipeline cracked.
a)
Tighten the union.
b)
Call the after-sales
service.
A control device is remaining on.
a)
The switch has broken.
b)
A solenoid valve has jammed.
a)
Call the after-sales
service.
b)
Call the after-sales
service.
The self- centring cylinder is
losing pressure (NAV26HW -
NAV26HW.S).
a)
The directional control valve is
leaking.
b)
The gaskets are worn.
a)
Call the after-sales
service.
b)
Call the after-sales
service.
The motor stops during opera-
tion.
Overload cutout tripped.
Open the electrical panel and reset
the overload cutout tripped.
