Watson-Marlow SP Series - Manual (Page 22)

22
CAUTION
When the pressing shoes are worn the compression force of the hose could
decrease. If the compression force is too low, this results in a loss of capacity
by the backflow of the liquid to be pumped. Backflow results in a reduction of
the life of the pump hose.
7.7 Exchanging replacement parts
7.7.1 Replacing pressing shoes (not applicable for SP/10, SP/15 and SP/20)
• Remove the pump hose and cover. See paragraph 7.5.1 through 7.5.8
• Loosen the retaining bolt(s) of the pressing shoe a few turns. Remove the shims.
• Loosen the retaining bolt(s) of pressing shoe completely and remove the pressing
shoe.
• Fit the eventually removed shims again. Position the (new) pressing shoe, tighten
the retaining bolt(s), see “Specifications”: “Torques”, § 10.1.6.
• Repeat the procedure for removing and fitting the second pressing shoe by
repeating above mentioned steps.
WARNING
Never remove the pump cover whilst the hose is in place.
The front covers of the series SP/25 to SP/100 should not be removed whilst
the hose is in place. This can cause a deformation of the pump casing and a
non straight tension of the bolts. After fitting the cover and starting up the
pump, the bolts can be extremely forced and break.
• Check the cover O-ring for damage and replace if necessary. Refit the cover. Make
sure that the bolts are refitted and that they are tightened in the correct order,
diagonally opposite each other, see “Specifications”: ‘Torques”, § 10.1.6.
• Switch on the electrical supply.
• Replace hose and refill the lubricant, see paragraph 7.5.9 through 7.6.5
7.7.2 Replacing seal and bearings
• Remove the pump hose and cover, see paragraph 7.5.1 through 7.5.8
• Isolate the pump from the electrical supply.
• Loosen coupling on drive end of shaft.
• Remove rotor retaining ring and pull rotor off shaft.
• Remove bearing cover for SP/25 to SP/100, or joint ring and safety ring for SP/10,
SP/15 and SP/20.
• Pull shaft assembly out at rotor side.
• Use arbor press and V-block to remove both bearings from shaft. Use file to deburr
key ways.
• Remove lip seals from housing and bearing cover. It is recommended to replace
seals whenever shaft has been removed.