Crankshaft Bearing Housing Assembly Instructions for Well Stimulation Pumps {1202, 5070} Caterpillar

Well Stimulation Pump

WS223 (S/N: SR31-UP)

WS223 SS (S/N: BM31-UP)

WS223 XD (S/N: SR41-UP)

WS273 XD (S/N: DG21-UP)

WS305 XD (S/N: EA21-UP)

Well Stimulation Pump Power End

WSP223 (S/N: FNJ1-UP)

WSP273 (S/N: DG31-UP)

WSP305 (S/N: EA31-UP)

Introduction

This Special Instruction is intended to give information on assembling the crankshaft bearing housings 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.

Required Parts

Installation Procedure

Note: Bearing housings are installed onto the crankshaft after the main bearings are installed.

Note: Each bearing housing is mated with a cap half and a rod half. The two mated halves MUST stay paired together.

Note: The WS223, WS273, and WS305 bearing housing cap half should have two external dowel pins welded in place to retain the cap half bearing. The internal depth of the dowel pin should be 6.35 mm (0.25 inch).

Note: Use caution when installing the thrust bearings. Ensure that the thrust bearings are aligned correctly into the bearing housing.

Note: Ensure that all components are thoroughly cleaned.

Note: WS223 Rod half bearing will have a lube groove in the center. This bearing half is not illustrated in this work instruction.

Illustration 1	g06034170
Cap half of the bearing (1) 3G-8479 Pin (Dowel Pin)

Illustration 2	g06034172
Rod half of the bearing

1. Separate the rod half from the cap half.
   Show/hide table

   Illustration 3	g06034179
   Rod half of the bearing (2) 459-1876 Stud

2. Apply Loctite 263^® High Strength Threadlocker to the last 3 threads to 4 threads of the studs.

3. Install six studs (2) into the rod half of the bearing housings until each stud is fully engaged. Ensure that the studs are engaged with all threads in the bearing housing.

4. Flip the rod half over onto a level surface to ensure that the studs are installed completely and at the same depth.

5. Identify the cap half bearing and the rod half bearing. The cap half has two dowel pins to hold the cap half bearing in the appropriate location.

6. Clean all the bearing surfaces.

7. Insert the thrust bearing into the rod half of the bearing housing. Confirm that the bearing is fully seated in the housing.

8. Insert the thrust bearing into the cap half of the bearing housing. Ensure that the bearing is fully seated over the dowel pins.

9. Repeat Steps 1 and 8 above for the remaining bearing assembly housings.

10. Using a suitable lifting device, raise the crankshaft and stabilize at a height that is best for assembly. Confirm that the crankshaft is stable and safe to work on.
    Show/hide table

    Illustration 4	g06034198

11. Completely cover the crankshaft journal with a dry lubricant (dry moly).

12. Apply a liberal coating of 129-1966 Multipurpose Grease or equivalent to the crankshaft journal.

13. Use a floor jack and a board to help support the rod half of the bearing housing. Place the rod half onto the jack or board and slide underneath the crankshaft journal.

14. Raise the rod half until the rod half is sitting in the proper position against the crankshaft journal.

15. Place the cap half on top of the crankshaft journal.

    Note: Make sure that the dowel pins in the cap half are aligned with the dowel holes in the rod half.

    Show/hide table

    Illustration 5	g06034206
    (3) 459-4116 Bolt (4) 3B-4516 Lockwasher

16. Apply Loctite 263 High Strength Threadlocker to the last 3 threads to 4 threads of the bolts.

17. Secure the cap half to the rod half with two bolts (3) and two washers (4) in opposite corners to hold the two halves together.
    Show/hide table

    Illustration 6	g06034229

18. Install the remaining two bolts (3) and two washers (4) tighten equally until the gap closes between the rod half and cap half.

    Torque bolts ... 922 N·m (680 lb ft)

19. Rotate the bearing assembly housing on the crankshaft journal to make sure that the bearing assembly housing rotates freely.

    Note: If the bearing assembly housing locks down on the crankshaft, remove and check for out of tolerance parts.

20. Repeat steps until the remaining bearing housings are assembled and torqued.
    Show/hide table

    Illustration 7	g06034230
    (5) 434-9952 Wedge (Brass)

21. Drive two wedges (5) between the bearing assembly housings and the crankshaft cheeks to lock the bearing assembly housings into a position clearing the outer races in the frame.