2 – 23
OPERATION
2-11 CRAWLER EXTENSION/RETRACTION
This machine is equipped with the spanner
mechanism (crawler extension / retraction
mechanism). Take the following procedure.
1. Jack up the main unit.
Set the blade to the rear and jack up the main unit
with the working device and blade cylinder till the
crawler is off from the ground to extend or retract
the crawler easily.
2. Lever selection
Set the selector lever to the spanner position.
3. Crawler extension / retraction
Set the engine speed at medium or higher.
Move the blade - spanner lever (blade lever)
forward or backward.
•
Crawler extension :
Push the lever forward.
•
Crawler retraction :
Pull the lever backward.
Extend or retract the crawler on a level ground
without an obstacle.
Extension or retraction is possible without
jacking up the main unit.
If there is an obstacle on the ground beside the
crawler, the resistance is larger and extension
or retraction is sometimes impossible.
The crawler may slightly shrink due to leak from
the hydraulic circuit during the work with the
crawler extended.
Sometimes extend the crawler to the end by the
spanner operating lever.
B
l
a
de-
spa
nner
s
ele
c
t
o
r le
v
er
B
l
a
de-
spa
nner le
v
er
Spa
nner
pos
iti
o
n
B
l
a
de
pos
iti
o
n
Cr
aw
ler
exten
s
i
o
n
Cr
aw
ler
retr
ac
ti
o
n
1
60
mm
1
60
mm
D
i
m
en
s
i
o
n
o
f
c
r
aw
ler
exten
s
i
o
n / retr
ac
ti
o
n
a
:
960
mm
a
: When retr
ac
ted
b
: When extended
b
:
12
80
mm
CAUTION
CAUTION
