5.
Refit the centring ring and strainer assembly and the O
‑
ring to the inlet port. Refit
the vacuum system to the pump inlet port.
Figure 5 Inlet strainer assembly
1. Centring ring and strainer
2. O
‑
ring
3. Pump inlet port
1. Centring ring and strainer
2. O
‑
ring
3. Pump inlet port
6.4 Inspect and clean the gas ballast control (if fitted)
Note:
The gas ballast filter element (
Figure: Gas ballast control assembly on page 28
, item 7) is
retained in its seating with adhesive, do not try to remove it.
1.
Refer to
Figure: Gas ballast control assembly on page 28
. Turn the gas ballast
control to the high flow position (II).
2.
Push the control down against the compression spring (item 6) as far as it will go,
then turn the control anti
‑
clockwise slightly to release the bayonet lugs (item 5)
and remove the control (item 1).
3.
If necessary, wipe the control with a clean, dry, lint
‑
free cloth and check that the
air hole (item 3) is not blocked.
4.
Refit the control into the gas ballast inlet and ensure that the compression spring
locates correctly between the bayonet lugs.
5.
Push the control down as far as it will go and then turn the control clockwise
slightly until the bayonet lugs engage correctly.
6.
Reset the gas ballast control to the required position.
Page 27
A73101880_F - Maintenance