6.7
Maintenance
The flattened medium part of the rod and the thread
must be absolutely free of grease. Seat and sealing
areas must by no means be damaged.
Reassembly:
Insert two discs (16&17) into the housing according to
the drawing. The sinter area of the first disc (17) (grey)
must point away from the housing in the direction to
the second steel disc (16). Turn the piston unit (9) on
the rod (12) until it stops. Hold the rod in a way that
the flattened part looks upward. Then turn the piston
unit back until for the first time a guiding area is parallel
with the flattened part of the rod.
Insert the spring (6) according to the drawing into the
housing against spring pressure in a way that the
flattened part points to the counterweight section of the
housing.
Block the rod (12). Install two discs (13&14) according
to the drawing. The sinter area of the first disc (13)
(grey) must point away from the housing in the
direction to the second steel disc (14). Wet the MHT-nut
(15) with Loctite 270, lock it, and loosen it again by a
1/6 turn. Insert the sealing ring (7) in the groove
provided in the cover (8). Put the cover (8) on top and
fix it by turning. Connection E must look downward.
Loosen blocking of the rod.
Install the control disc (1) according to the drawing. The
bore for idle operation must always point to the
counterweight section of the housing. Wet Tensilock
bolts (9) with loctite 270 and lock them. Lock with 9 N-
m (6.63 lb-ft). Install the plastic plug according to the
drawing. .
Function testing:
Connect to pressurized air and test smooth opening/
closing for several times. Adjust by turning the MHT-nut
(15) in either direction, if needed. Pay attention to
Loctite. If the time is too long, clean Loctite off the nut
and wet again .
Figure 17. Intake valve
HAKG
3 CONTROL DISC POSITION
DURING ASSEMBLY
DETAIL: ROTARY DRIVE UNIT
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