HDK-MT350_EN_06
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► Reinstall the check valve block with the tower connection pieces and the new
O-rings (see Page 48).
► Fit all mounting screws on the check valve block and tighten (tightening
torque 80 Nm).
► Secure the check valve block to the frame with the eight mounting screws.
► Reconnect the pipes to the after-filter.
► Reconnect plug of dewpoint sensor.
► Check that all screw connections are tight.
► If no other maintenance work is to be carried out: Restart the dryer (see
page 36).
Replacing check valve for pressure build-up
The check valves for
pressure build-up are wear
parts and should be
replaced every 24 months.
The two valves are located
on the side of the solenoid
valve block.
Replacing pressure build-up valve
Follow the steps described in the following to change the check valves:
► Depressurise the dryer and shut it down (see page 35).
► Undo plug screw (17)
► Remove metal ring (16)
Note!
Make sure that you keep this ring (16) in a safe place and reinstall it when
reassembling the check valve!
► Use special tool (Item 3) to pull out the bush (15), compression spring (14)
and piston (13).
► Use special tool (Item 4) to carefully remove valve seat (11) from the hole.
The check valve has been removed.
Note on avoiding assembly errors!
Fit all internal parts without grease!
Always replace the O-rings (12, 18).
Install the new check valve as follows:
► Fit new O-ring (12) on valve seat (11).
