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5. MAINTENANCE:
Preventive maintenance schedule is the periodical checks and precautions by which
possibilities of failure and breakdown are made very remote.
5.1 Daily Checks
5.1.1 Pressure gauge reading.
5.1.2 Bearing temperature.
5.1.3 Leakage through stuffing box.
5.1.4 Noise and vibration.
5.1.5 Voltage and current.
5.2 Periodical Maintenance
5.2.1 Replenish the grease.
5.2.2 Check the stuffing box packing.
5.2.3 Check the alignment of the pumpset.
5.2.4 Calibrate the measuring instruments.
5.2.5 Check the sealing and cooling connections for leakage etc.
6. OVERHAULING:
With normal daily operating spell, the pump will be due for overhaul after about
5000 working hours. This work should be done by skilled personnel.
6.1 Dismantling and Assembling procedure
All DSM pumps are similar in construction except some minor changes in
the parts. The important changes are:
6.1.1 Shaft sleeves (310,311) are not provided in DSM-3 and DSM-1E, 2E, 3ME
pumps.
6.1.2 Stuffing box bushes (350) are not provided in DSM-1E, 2E, 65 DSM-
315M, DSM-4RM, DSM-4RN, DSM-4RR and DSM-150-45 pumps.
6.1.3 Separate lantern ring (227) is not provided in DSM-3, DSM-3ME pump
since the same is made integral with Stuffing Box Bush.
6.1.4 Threaded shaft sleeves (310, 311) are used in DSM-4RM, DSM-4RN,
DSM-4RR pump where as other sleeves are keyed ones.
6.1.5 Coupling spacer (195) is not provided in DSM-4RM & DSM-150-45 pumps
6.1.6 Coupling nut (332) is not provided in DSM-4RM, DSM-6 and DSM-150-45
pumps.
6.1.7 Allen bolts are provided for top & bottom casing of DSM 150-45 pump
where as other pumps have standard bolt nuts and studs with nuts.
Please refer to the cross sectional drawings and spare parts list given in
this booklet while dismantling and reassembling.
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