MAINTENANCE
SM-DK50 DS-EN-20_02-2016 21
Replacing the piston, connecting rod and piston rings
Disconnect the pressure hose (1).
Remove the crankcase cover (2) and pull off the cylinder head (3).
Disassemble the spring (4) and valve plate (5) with O-rings (6) (2 pcs) and
carefully remove the cylinder (7).
Remove the screw (8) on the piston’s connecting rod (9), eject the
connecting rod from the bearing (10) and take it out.
Install the new connecting rod with the piston on the bearing (around
11.5 mm from the crank), install the cylinder (7) and secure using
compound with item no. 023000239 (12) and 2 bolts; then rotate the crank
a number of times (at least 10 times), check the position of the connecting
rod in the piston (11) and adjust the torque applied on the connecting rod
bolt (8) to a torque of 2.5 Nm + 0.5 Nm. If the connecting rod is not
positioned correctly, reposition the connecting rod on the bearing and
tighten the screw on the connecting rod.
Remove the cylinder fitting and place the cylinder onto the crankcase.
Assemble the valve plate (5) with O-rings (6) (2 pcs) and spring (4). Cover
with the cylinder head (3) and secure it with the screws (4 pcs) with
washers (4 pcs).
Turn the crank several times to ensure that the connecting rod moves
smoothly. Attach the crankcase cover (2) using screws (6 pcs). Connect
the pressure hose.
Replacing the bearing:
Disassembly
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