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maintenance
A533-23-880 Issue C
10.Refer to Figure 1. Use a new trapped ‘O’ ring and clamp to secure the check-valve (18) to the elbow (20). Ensure
that the flow arrow on the check valve (Figure 49, item 7) points away from the elbow towards the exhaust
extraction system.
11.Refer to Figure 1. Refit the exhaust enclosure (26) using the screws connecting to the rear bulkhead cover, drip
tray (27) and exhaust enclosure top plate.
12.Use a new trapped 'O' ring (not supplied) and the NW40 clamp (removed in Section 6.6.1) to secure the check-
valve outlet to the exhaust-extraction system.
6.6.1 Dismantle, Clean and Refit the Exhaust Silencer
Note: This requires a check valve service kit. Refer to Section 8.3.
1. Refer to Figure 1. Remove the screws that secure the drip tray (27) to the iF system. Remove and retain the drip
tray.
2. Refer to Figure 48. Undo the bracket (5) that secures the exhaust silencer to the iF system.
3. Remove the NW40 clamp (3) and trapped O’ring (2) that secures the silencer (6) to the manifold (4). Dispose of
the trapped O’ring. Remove the silencer from the iF system, retaining the bracket (5).
4. Refer to Figure 47. Remove and retain the six M5 cap head screws (1) and washers (2) that fix the top flange
assembly to the silencer body (11).
5. Separate the top flange assembly and body. Remove the O’ring (7) from the O’ring groove (8). Remove the two
labels (10) from the side of the silencer. Dispose of the O’ring and labels safely - refer to Section 7.
6. Empty all loose deposits from the silencer body and top flange assembly. Take care not to damage the sealing
surfaces on the underside of the top flange assembly, the O’ring groove and the NW40 flanges.
7. Use suitable tools to dislodge any remaining deposits, then wash the silencer body and top flange assembly with
steam or water. Finally, bead blast the internals of the silencer. Protect all sealing faces, the drilled and tapped
holes during cleaning and bead blasting. If required, use a cleaning solution suitable for the nature of the
deposits.
8. Inspect the silencer for internal corrosion. Check that the walls of the silencer body and the top flange plate are
not excessively eroded. Inspect the sealing surfaces on the underside of the top flange assembly, the O’ring
groove and the NW40 flanges for damage and re-finish if necessary. If the damage to the silencer is excessive, it
should be replaced.
9. Check that the O’ring groove is clean. Place the new O’ring (Supplied in the service kit) in the groove.
10.Refit the top flange assembly to the silencer body and fasten using the retained screws and washers. Tighten the
screws evenly to a torque of 6.9 to 7.1 Nm. Altering between the screws on the top flange assembly to ensure
that the O’ring is evenly compressed.
11.Leak test the silencer, and seal any leaks that are found. Refer to the main pump instruction manual for more
information about leak testing. If required, mark the screws with heat resistant security paint after successful
leak testing, to show continued integrity of the seal after installation.
12.Refer to Figure 48. Check that the mating surfaces of the exhaust manifold (4) and silencer (6) flanges are not
scratched or damaged: If necessary re-finish the surfaces.
13.Affix the new hot surface warning labels (supplied in the service kit) to the sides of the silencer.
14.Insert the silencer into the iF system and loosely fit the bracket assembly (4). Use the new NW40 trapped O’ring
(supplied in the service kit) and the NW40 clamp to secure the silencer to the exhaust manifold. Tighten the
bracket assembly.
15.Use the cap head screws and washers (retained in step 1) to secure the drip tray to the iF system.
16.Continue at step 7 of Section 6.6.
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