Dismantling and reassembly of the
hammer piston and hammer piston
guide
Dismantling
Dismantle the hammer piston (1) together with the
hammer piston guide (2) from the hammer cylinder
(3).
Withdraw the piston from the piston guide, and dis-
mantle and discard the piston ring (5) and the O-ring
(4).
Examine the condition of the groove.
Note: When replacing the piston ring and O-ring of
the hammer piston, the piston ring and O-ring of the
drive piston should be replaced at the same time.
Examine the hammer surface (A) for wear.
Examine the condition of the piston rod and flange of
the piston, and replace them if there are any
scratches or signs of cracking.
Remove and discard the O-rings (1), (2), (3) and (4),
support ring (5) and scraper ring (6) of the hammer
piston guide (10).
Tap a sharp screwdriver into the locking ring (7)
without damaging the groove in the guide. Bend out
and remove the locking ring, which must be dis-
carded after removal.
Dismantle and discard the sealing ring (8) and the
O-ring (9).
Reassembly
Fit a new O-ring (9) and sealing ring (8).
Note: Check the direction (A) of the sealing ring (8).
Locate service tool S26 in the piston guide. Fit a new
locking ring (7) in the tool, and tap the locking ring
down into the piston guide with service tool S20.
Check that the locking ring is correctly engaged in
the groove.
Fit new O-rings (1), (2), (3) and (4), and a new sup-
port ring (5) and scraper ring (6).
Fit a new piston ring (1) and O-ring (2) to the ham
-
mer piston. Lubricate the piston rod and insert it into
the hammer piston guide.
20
Fig. 20
Fig. 21
Fig. 22
To Next Page
Loading...
Need help?
General
