General Pump T16A-18A-20A-22A - Manual (Page 9)

GENERAL PUMP
A member of the Interpump Group
KT16A/18A/20A/22A SERIES
A) Disassembly/Reassembly of the crankshaft without bearings replacement
After having removed the side covers as indicated in point 2.1.1, check the conditions of the rollers and their
relative tracks. If all parts are in good condition, clean the components carefully with a degreaser and
redistribute lubricant oil uniformly. The previous shims can be reused, taking care to insert them only under
the indicator side cover.
Once the complete unit is mounted (indicator side flange and shaft and motor side flange), check that the
rotation torque of the shaft - with the con-rod disconnected - is a minimum 3 Ft.Lbs. (4 Nm), max. 4.5 Ft.Lbs
(6 Nm).
To bring the two side covers closer to the casing, it is possible to use 3 M6x40 screws for the first positioning
phase as indicated in fig. 8 and the screws provide for final fastening.
Shaft rotation torque (with the con-rod connected) should not exceed 6 Ft.Lb. (8 Nm).
A) Disassembly/Reassembly of the crankshaft with bearings replacement
After removing the side covers, as described above, remove the outer ring nut on the bearings from its seat
on the covers, using an appropriate extractor as shown in fig. 12 and 12a.
Remove the inner ring on the bearings from the two ends of the shaft, again using an appropriate extractor
or, alternatively, a simple “pin punch” as shown in fig. 13.
The new bearings can be mounted cold with a press or rocker, supporting it on the lateral surface of the
ring nuts involved in press fitting with the rings. The press fitting operation can be facilitated by heating the
involved parts to a temperature between 250 o -300 o F ( 120 o -300 o C), ensuring that the ring nuts go down to
end stroke in their housings.
Never exchange the parts of the two bearings.
Page 9
Ref 300942 Rev.A
03-14