Flowserve MSX Series - Bearings; Recommended Torques for Threaded Fasteners

Flowserve Pump Division - 25
BEARINGS
MSX Series 2 pumps are furnished with grease-lubricated bearings, which are sealed for life. Proper
grease lubrication is very important. Anti-friction bearings can be over-greased as well as under-greased.
Any time maintenance is performed on the bearings, they should be repacked with grease, and the
bearing chamber should be filled approximately 75% full.
The bearings are to be lubricated with a premium quality Lithium-Complex EP2 grease suitable for
greased-for-life, anti-friction bearing use. The grease contains rust and oxidation inhibitors and extreme
pressure additives. The grease should have a viscosity of 14.1 cSt at 100° C and a minimum Timken OK
load rating of 60 lbs. Flowserve Pump Division recommends using Mobil Infinitec 152.
RECOMMENDED TORQUES FOR THREADED FASTENERS
The following tables are provided as a guide for the proper assembly of fasteners. Torques are for NON-
lubricated threads.
Hex Head Cap Screw Socket Head Cap Screw
(Bumax 88 Impeller Bolt)
HH Cap
Screw
Diameter
Number
Threads
Wrench
Torque
(lb-ft)
SH Cap
Screw
Diameter
Number
Threads
Wrench
Torque
(lb-ft)
0.250 20 5 0.375 16 28
0.313 18 9 0.500 13 70
0.375 16 16 0.625 11 138
0.438 14 25
0.500 13 39 Notes:
0.563 12 55
0.625 11 77
0.750 10 134
Apply Loctite 2760 liberally to
threads and shoulder face at
assembly.
0.875 9 215
1.000 8 320
1.125 8 465
1.250 8 649
1.375 8 874
1.500 8 1147
The torque values listed
above are specifically for
Bumax 88 high strength
fasteners. Fasteners will
show the “Bumax” name on
bolt head.
Note: Assemble joints without
Adding lubricant.
CAUTION: FOR ASSEMBLY OF A JOINT ALWAYS FINGER-TIGHTEN ALL NUTS OR BOLTS
FIRST. THEN CROSS-TIGHTEN EVENLY IN ABOUT THREE EQUAL STEPS TO
DEVELOP FINAL TORQUE VALUES.