Page 209 - CITS - Fitter Trade Practical - Volume -2

FITTER - CITS

Job Sequence

TASK 1: Dismantle the gear pump
1 Clamp the unit in a vice from the flange side. (Fig 1)
Note : Make sure the vice jaws are clean and have smooth surfaces

2 Use an Allen head socket wrench to loosen the bolts on the cover assembly. (Fig 2)
3 Unscrew the bolts completely and remove them. (Fig 3)
Inspect the threads for damage

4 Remove the cover assembly carefully.(Fig 1)
Note : Some of the pumps may have a shaft seal, in such a case remove the cover assembly with care
to prevent any damage to the seal.
5 Place the cover assembly on the work bench. Inspect the wear plate for wear and tear.
Remove the wear plate and seal ring from the cover assembly.(Fig 2)

Fig 1 Fig 2

Note : Do not use sharp tools to remove the seal
6 Carefully remove the gear plate and remove the dowel pins.(Fig 3)

Note : During disassembling the unit,mark the relative positions of the gear mesh and the body that
helps during reassembly.
7 Remove the idler shaft and drive shaft from it’s bearing bore (Fig 4 & 5).
Note : Inspect the journals and the flat faces top and bottom of the gears. Ensure these surfaces are
free from burrs or scratches. If scratches are found, clean them with very fine emery cloth.
8 Rewash the gears with light oil.

9 Remove the wear plate from the assembly. (Fig 6)
• Inspect the lower wear plate for wear, or marks caused by overheating.
• Replace if necessary.

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CITS : C G & M - Fitter - Exercise 90