2920 1257 04
36
Instruction book
5 Servicing and adjustment
procedures
Warning Release the pressure from the compressor before
starting repair or maintenance works. Switch
off the voltage and isolate the compressor from
the mains.
5.1 Unloader or check valve
Dirt, condensate, coke formation and oxidation influence the
proper operation of the valve. Depending on the working
conditions (ambient temperature, working pressure, load cycle,
oil type), it is recommended to replace the unloader or check
valve as indicated in section 4.2. Replacement instructions
are included in the maintenance kits.
5.2 Valves
A faulty valve must be replaced immediately. A faulty valve
can be discovered as stated in section 6, points 1 and 4. It is
highly recommended to replace the valve discs, O-rings and
joints when the cylinder heads are disassembled.
Replacement of valve discs (Figs. 5.1 and 5.2)
LE15/55 LE75 60 Hz Operation sequence
LE75 50 Hz HP cylinder
LF15/40 LE110/150
LE75 60 Hz HP cylinder
LP cylinder LT15/110
LE110/150 HP cylinder
LP cylinder LF55/75
LT15/110 HP cylinder
LP cylinder
LF55/75
LP cylinder
••Remove the fan guard, unscrew
the cap and remove the cover (1-
Fig. 1.1), air filter and cover of
the air inlet silencer.
• Disconnect cylinder head cover
(12) from the inlet and outlet pipe
flanges. Remove cover (12).
• Disconnect head (13) from the
inlet and outlet pipe flanges.
Remove cylinder head cover
(12). Remove head (13).
Fig. 5.1 LE, LF15 up to -40 and low-pressure side of LT
and LF55
Fig. 5.2 High-pressure side of LT and LF55
1 Bolt
2 Joint
3 O-ring
4 Spring
5 Outlet valve guard
6 Outlet valve disc
7 Valve seat
8 Inlet valve disc
9 Guide pin
10 Joint
11 Cylinder
12 Cylinder cover
13 Cylinder head
14 Joint
Figs. 5.1 and 5.2 Cylinder heads
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