
Doc. No.: OMS500000104
Rev: A Page 33 of 42
Subject to contractual terms and conditions to the contrary, this document and all the information contained herein are the confidential and exclusive
property of FMC Technologies, and may not be reproduced, disclosed, or made public in any manner prior to express written authorization by FMC.
10.0
Fastener Torque Requirements
No pump service procedure is complete without insuring that the fasteners have been properly
torqued. Failure to properly tighten the pump bolting could cause the pump to leak or even
allow the bolts to fail. Always use a calibrated torque wrench during the installation of all
critical fasteners listed below. Values are in FT-LBS and Newton meters. Typical sizes are
shown; other sizes may be used depending on application.
Power End
Item
Typical
Torque
Number
Description
Size
Material
Ft-lbs
N-m
20
Back Cover Bolts
0.500
-13-UNC
GR-5
40
54
19
Bearing Housing Bolts
0.750
-10-UNC
GR-5
130
176
3
Connecting Rod Bolts
0.625
-18-UNF
A193-B7
150
203
21 & 22
Cross Head Set Screw
0.375
-16-UNC
Alloy
20
27
17
Seal Holder Cap Screw
0.375
-16-UNC
GR-5
25
34
32
Cradle Cover Wing Nuts
0.375
-16-UNC
GR-2
25
34
6
Pony Rod to X Head
2.000
-12-UN
17-4 PH
450
610
15
Pony Rod/Plunger Clamp
0.750
-10-UNC
18-8 SST
95
129
Fluid End
Item
Typical
Torque
Number
Description
Size
Material
Ft-lbs
N-m
63
Attachment to Power End
1.375
-8-UN
A193-B7
1250
1,695
64
Valve Cover
M2828-M2834
1.125
-8-UN
A193-B7
600
813
M2836-M2840
1.125
-8-UN
A193-B7
600
813
78
Cylinder Cover
M2828-M2834
1.125
-8-UN
A193-B7
600
813
M2836-M2840
1.125
-8-UN
A193-B7
600
813
66
Stuffing Box Clamp
M2816-M2818
1.000
-8-UNC
A193-B7
400
542
M2820-M2826
1.000
-8-UNC
A193-B7
400
542
M2828-M2834
0.875
-9-UNC
A193-B7
275
373
M2836-M2840
0.750
-10-UNC
A193-B7
175
237
68
Suction Manifold Bolts
M2828-M2834
0.500
-13-UNC
A193-B7
50
68
M2836-M2840
0.500
-13-UNC
A193-B7
50
68
Refer to figures on pages 11 and 12 for item numbers.