Page 11
20
H
2
H
1
Y
5
Y
55
S
21
S
2
S
11
S
1
G
11
G
1
G
5
G
51
G
3
G
2
R
EPAIR
I
NSTRUCTIONS
1. Removal and Re-assembly of Water Jacket (fig. 12, 13 and data sheets D 134 + D 137)
• Switch off VWZ and vent to atmospheric
pressure
• Open plug (U
25
) or (U
26
).
• Drain off cooling liquid:
- VWZ (14)
➝
drain cock (K
4
).
- VWZ (13)
➝
drain cock (K
4
). Drainage is
completed by opening plug (K
41
) at the base
of the radiator (R).
• Disconnect the cables of following devices
at the terminal box (G) :
- VWZ (14)
➝
thermostat (U
1
) and level switch
(V
4
).
- VWZ (13)
➝
thermostat (U), level switch (V
4
)
and fan (R
1
).
- Disconnection is unnecessary if you have a
cable conduit and open the cover.
• Remove plug (Y
42
) and turn eye bolts M 12.
• Support the water jacket at eye bolts (Y
42
) by
S-shaped hooks and crane.
• Remove the allen bolts (Y
41
) with an ex-
tended allen key (approx. 1 m).
• Separate the water jacket (Y
4
) from the
connection cover (Y
5
) with a crane and place
on wooden blocks.
• Refit the water jacket in the reverse order.
• Use new sealing rings if necessary.
• Fill with coolant at (H
4
).
2. Changing LP and HP Stages (fig. 20)
• Removal and Refitting of LP and HP stages are the same.
2.1 Removal of Stages
• Remove water jacket (see above).
• Drain bearing oil:
- LP Stage at (K
1
) / HP Stage at (K
2
).
• Support stage (S
1
) or (S
2
) by slings from crane.
• Remove allen bolts (S
11
) or (S
21
).
• With gentle rocking movements, withdraw stage from flange complete with half coupling.
2.2 Refitting of Stages
• Before refitting, clean out the connecting passage ways (Y
55
) in the connection cover (Y
5
).
• When not replacing the stages, the ports (S
15
fig. 27) must be cleaned, taking care that no dirt enters the compression
chambers (S
16
fig. 27).
• Lightly smear both faces of gasket (30) with anti-seize, non-setting universal jointing compound (see E165/1).
• Refitting is reverse of removal.
• Use new sealing rings if necessary.
• Fill bearing oil tanks:
- LP stage at (H
1
) / HP stage at (H
2
).
• Refit water jacket (see above)
3.
Removal and Reassembly of Drive (fig. 21)
• Disconnect cable of motor (G
1
).
• Remove hex-nuts (G
11
) and withdraw motor from mounting flange
(G
2
) with half coupling (G
3
).
• Remove hex-nuts (G
51
) from mounting flange (G
2
)
and separate from base frame (G
5
).
• Remove hex-nuts (G
21
) and withdraw
mounting flange (G
2
) from gear-
box housing (Y
3
).
• The half coupling (G
3
)
can now easily be
reached.
• Refit in reverse order.
´
` ¸
Y
3
21
