Goulds Pumps 3600 - IOM - Manual (Page 81)

Maintenance
c) Pull the rotating element towards the thrust end until it stops.
d) Again, measure the distance from the thrust bearing shoulder on the shaft to the
bearing housing face on the casing.
The difference between the two measurements is the total travel of the rotating
element.
e) Calculate the average of these dimensions.
f)
Measure the shoulder depth on the inboard cover (160) and subtract the calculated
average dimension.The result is the spacer (217) thickness required to properly center
the rotating element.
g) Remachine the spacer as necessary making sure that both faces are parallel within
0.001 in. (0.025 mm).
Confirm the seal chamber runout
The bearing housings are doweled to the casing (100) during the original build. However, to
assure the correct running position of the shaft, use the following procedure to confirm the seal
chamber runout before installing the cartridge mechanical seals:
1. Install the old bearings on the shaft and bolt the bearing housings to the casing.
2. Mount the dial indicator on the shaft (122). Rotate the shaft (122) so that the indicator rides
along the seal chamber bore for 180°.
3. If the total indicator reading exceeds 0.005 in. (0.127 mm), determine the cause and make
corrections.
For further instructions see Align the rotor.
4. Check the seal-chamber face runout.
a) With a dial indicator mounted on the shaft, rotate the shaft so that the indicator rides
along the seal-chamber face for 180°.
b) If the total indicator reading exceeds the allowable runout as shown in the following
table, determine the cause and make corrections.
Size Maximum allowable total indicator reading in
inches (millimeters)
Remaining sizes 0.0030 (0.0762)
10x12-14.5 0.0033 (0.0838)
6x8-13 0.0035 (0.0889)
5. Remove the dowel pins and unbolt the bearing housings. Discard the old bearings.
Qualify the casing bores
Three casing bores are used as datums during the centering procedure: the two seal chamber
bores and the center case bushing bore. If these bores are not in alignment or are of different
sizes, then compensation is required in order to accommodate the deviation(s). Qualification of
these three bores must occur before you align the rotor.
1. Measure the ring bores with a plug gauge and correct any conditions that are out of
tolerance.
Model 3600, API 610 8th, 9th, 10th & 11th Editions (ISO 13709) Installation, Operation, and Maintenance Manual 79