INSTRUCTION, USE AND
MAINTENANCE MANUAL
GB
Page 21 of 96
Whenever the rim exceeds the 42”, in the locking point,
use the appropriate extensions supplied with the tyre-
changer. To avoid damages or scratches on light alloy
rims, the special jaws supplied with the tyre changer
as an optional should be used.
AFTER COMPLETION OF TYRE
MOUNT/DEMOUNT OPERATIONS
DO NOT LEAVE THE WHEEL
CLAMPED ON THE SELF-CEN-
TRING CHUCK AND NEVER LEAVE
IT UNATTENDED ANYWAY.
DURING ALL TYRES MOUNTING AND DE-
MOUNTING OPERATIONS, THE SELF-CENTRING
CHUCK ROTATION SPEED CAN BE DOUBLED
BY ROTATING THE SELECTOR (FIG. 8, 9A E
9B REF. C).
LOW SPEED IS RECOMMENDED FOR WHEELS
WITH GREAT DIAMETER AND WEIGHT.
THE CAREFUL LUBRICATION OF THE TYRES
BEADS IS ALSO RECOMMENDED, IN ORDER
TO PROTECT THEM FROM POSSIBLE DAM-
AGES AND TO FACILITATE MOUNTING AND
DEMOUNTING OPERATIONS.
12.5 Functioning of tool holder arm
During the working phases, the tool holder arm can
maintain two firm positions, that is:
1) “Working” position;
2) “Out of work” position.
In “working” position (
Fig. 17 ref. 1
) the tool holder
arm is lowered towards the mandrel and from this
position it executes the various tyre bead breaking,
demounting and mounting operations.
1
Fig. 17
In “out of work” position (
Fig. 18 ref. 1
): the tool
holder arm is in vertical position and has to be brought
in this position every time it is not in use and in order
to be shifted from one tyre bead side to another, dur-
ing working phase.
7522-M004-1_B
NAV51.15 - NAV51T.15 - NAV51.15N
1
Fig. 18
The tool holder arm moves from “out of work” posi-
tion to “working position”, manually (
NAV51.15N
)
or through an hydraulic cylinder (
NAV51.15 -
NAV51T.15
).
IN WORK POSITION, THE SAFETY
JACKS (FIG. 1 AND 2 REF. 8) MUST
BE HOOKED TO THE TOOL CAR-
RIAGE (FIG. 1 AND 2 REF. 12).
On the contrary, in order to reach “out of work” po-
sition from “working position”, the tool holder arm
moves when the pedal provided is pushed (
Fig. 2
ref. 19
) in case of
NAV51.15N
or when the handle
control operating the cylinder is controlled (
Fig. 1
ref. 19
) in case of
NAV51.15 - NAV51T.15
.
When the tool holder arm is in “out of work” position,
it can be laterally shifted in automatic mode in one
of the two positions (
NAV51.15 - NAV51T.15
) or in
manual mode in one of the three (
NAV51.15N
) pre-set
positions on the carriage, so that it can better posi-
tioned (according to the operations to be performed
afterwards) before it reaches “working” position again.
