Komatsu PC88MR-10 Shop Manual page 1244

50 Disassembly and assembly
Cab and its attachments
10)Check the operation of the wiper arm when
the front window is wet with washer fluid.
1] Hold down window washer switch (39) for
a few seconds to wet the front window
sufficiently, and then release the switch.
2] Check that wiper arm (27) swings 2
round-trips and then is stowed in the right
stay.
3] Perform step 1] again.
4] Check that wiper arm (27) swings odd
number of round-trips and then is stowed
in the right stay.
5] Hold down window washer switch (39) to
operate the wiper and check the
followings.
When the tip of wiper blade (35) is at
the highest position, wiper slider (40)
and stopper (41) do not interfere each
other (clicks in case of interference).
When the tip of wiper blade (35) is at
the lowest position, wiper blade (35)
and front window seal (42) do not
interfere each other.
50-216
11)In case of abnormality as results of the
above checks, adjust the wiper arm
installation as described in step 3.
6. Perform the subsequent installation in the
reverse order to removal.
PC88MR-10