B064-04-880 Issue F
Page 40
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Appendix A1
10. Dismantle the interior jet stack by unscrewing the top jet cap (10), followed by unscrewing the tie rod (7) from
the securing plate.
11. Either clean the components in a degreasing tank, or wipe down the components with a suitable paraffin-based
solvent. Pay particular attention to the jet formation areas. If there are solid deposits on the components,
remove with an abrasive.
12. Undo the single M6 fixing screw (Picture C) and remove the backing baffle assembly (9) from the backing body of
the pump, and follow the same cleaning procedure as above.
A1.2.3
Fluid-return pipework flush out
Whilst the pump is disassembled, it is recommended that the accessible oil return pipework be flushed.
1. Refer to
. Either pour or spray under pressure a suitable paraffin-based solvent into the backing
body (11), and verify that the solvent drains into the boiler without obstruction.
2. Either pour or spray under pressure a suitable paraffin-based solvent into the top of the main tee (12).
3. If the flow of the solvent appears obstructed use a flexible rod to clear the obstruction.
A1.3
Gasket and O-ring renewal
Refer to
. Where pump or vacuum system joints have been broken, new O-rings must be fitted. These are:
A1.4
Interior re-assembly
1. Before re-assembly, clean the boiler to ensure that no flush through residue remains.
2. Refer to
. Screw the tie rod (7) into the lower vapour tube (8) of the interior jet stack.
3. Insert the above components into the main cone (5), and hold them in as you slide the main cone over the flange
of the main tee (12).
4. Tighten the 6 x M6 screws that fix the lower vapour tube (8).
5. Lower the remaining interior components through the pump inlet.
6. Screw in the top jet cap (10). If there is sufficient overhead clearance, it is recommended that the third jet gap
is checked by feeler gauge for uniformity (0.89/1.0 mm).
7. Once the interior jet stack is secure, attach the main cone (5) to the main tee (12).
8. Bolt the guard ring into the pump inlet. When cold, the position of the guard ring should be set so that the
bottom edges of the top jet cap and guard ring cones are level (Picture E).
Table A1 - 30B5 O-rings
O-ring
Product Code
1” drain port (2)
H021 26 026
Drain flange
H021 26 062
Pump inlet flange (Picture E)
H021 06 259
Pump outlet flange (Picture C)
H021 26 083
Main cone (4)
H021 06 091
Interior gasket (13)
B064 06 146