FLANGE 2S7527 - Caterpillar

Well PumpWS255 (S/N: SR51-UP)WS255 SS (S/N: BM51-UP)WS255 XD (S/N: SR61-UP)WSP255 (S/N: FNK1-UP)Introduction
This Special Instruction is intended to give information on pre-assembling the crankshaft for certain well stimulation pumps.Do not perform any procedure in this Special Instruction until you have read the information and you understand the information.Also ensure that you are following all safety precautions while you are performing the procedures outlined in this document.Safety Section
Always wear protective gloves when handling parts that have been heated.
Serious injury can result from failure to use personal protective equipment. Wear the appropriate personal protective equipment that is required for the tasks that are being performed.
Always wear protective gloves when handling parts that have been cooled down in dry ice or liquid nitrogen.
Required Parts
Table 1
Qty Part Number Description
1 N/A Crankshaft (WS255)
2 434-9864 Bearing
2 434-9865 Bearing
2 434-9866 Bearing
10 492-4407 Bolt
10 434-9920 Washer
32 492-4406 Bolt
64 434-9919 Washer
32 6V-8801 Nut
Illustration 1 g06257882
(1) Crankshaft
(2) 434-9864 Bearing As
(3) 434-9865 Bearing
(4) 434-9866 Bearing As
(5) 492-4407 Bolt
(6) 434-9920 Washer
(7) 492-4406 Bolt
(8) 434-9919 Washer
(9) 6V-8801 NutInstallation Procedure
Crankshaft Bearing Installation
Note: All bearings and races are shipped as a mated pair. If you damage a bearing race and the bearing race needs replaced, that corresponding bearing will need to be replaced as well.Note: All the races are interference fit, races 2, 3, 4, and 5 should be frozen prior to installation.Note: Races 1 and 6 are installed last, after the crankshaft is installed.Note: Leave races 1 and 6 out about a 6.35 mm (0.25 inch) and use the retaining ring to pull the race flush.Note: Take care not to mix up the inner races and outer races
Remove any excessive preservative coating or oil/grease from the inner and outer races
Using a paint marker or black Ink Marker, carefully mark the inner and outer races of each bearing with their proper location in the frame (i.e. 1, 2, 3, 4, 5, and 6).
Separate the marked bearings into inner races and outer races.The inner races will be installed on the crankshaft and be allowed to cool while the outer races are being installed in the power frame.
Illustration 2 g06024590
(1) Crankshaft
(7) 492-4406 Bolt
(8) 434-9919 Washer
(9) 6V-8801 Nut
Using a suitable lifting device, install crankshaft (1) into suitable supporting device. The crankshaft weighs approximately 733 kg (1616 lb).Note: "Drive End" is marked on the end of the crankshaft next to number 1 throw.The number one bearing will be on this end of the crankshaft, and the number six bearing on the opposite end.
Locate the "Drive End" of the crankshaft and mark the first bearing area as 1, the next bearing area as 2, and so on.
Beginning with the "Drive End" of the crankshaft pointing skyward, place five washers (8) onto the bottom face of bearing area 3 on the crankshaft. Use five bolts (7) and five nuts (9) to hold the washers in place temporarily.Note: All retaining washers must be installed with the recessed side facing the bolt head or nut.Note: Do NOT install the bearing retainers on