FMC Technologies FMC L06 - Critical Fastener Torque Specifications

Doc No: OMM50000903
Rev: B Page 54 of 65
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11.0 Fastener Torque Requirements
NOTICE: No pump service procedure is complete without insuring that the fasteners
have been properly torqued. Failure to properly tighten the pump bolts could cause the
pump to leak or possibly allow the pump to fail. Always use a calibrated torque wrench
during the installation of all critical fasteners listed in Table 4 below. Values are in foot-
pounds (Ft-lb) and Newton meters (N-m). Typical sizes are shown in Table 4 below.
Refer to Table 5 for other sizes that may be used depending on application.
POWER END
Item Component L06 & L06 HD L09 L09 HD
No. Description Size Ft-lb (N-m) Size Ft-lb (N-m) Size Ft-lb (N-m)
4 Connecting Rod Bolts 0.375 40 54 0.438 45 61 0.438 45 61
43 Piston Assembly Nut 0.750 35 47 0.750 35 47 0.750 35 47
42 Piston Rod Hex Nut 0.500 35 47 0.500 35 47 0.500 35 47
28 Bearing Housing Screws 0.375 25 34 0.375 25 34 0.375 25 34
28 Pinion Housing Screws N/A - - 0.375 25 34 N/A - -
29 Back Cover Bolts 0.375 20 27 0.375 20 27 0.375 20 27
27 Cross Head Set Screw 0.250 7 9 0.313 10 14 0.313 10 14
FLUID END
Item Component L06 & L06 HD L09 L09 HD
No. Description Size Ft-lb (N-m) Size Ft-lb (N-m) Size Ft-lb (N-m)
61 Cylinder Attach/Clamp Nut * † 0.625 120 163 0.500 75 102 N/A - -
61 Cylinder Attach/Clamp Nut * 0.625 90 122 0.625 90 122 0.625 120 163
49 Valve Cover Plug N/A - - 1.875 45 61 1.875 45 61
53 Valve Cover Nut * N/A - - 0.500 60 81 0.500 60 81
53 Valve Cover Nut * N/A - - 0.625 90 122 0.625 90 122
POWER END
Item Component L11 & L11 HD L12 L16
No. Description Size Ft-lb (N-m) Size Ft-lb (N-m) Size Ft-lb (N-m)
4 Connecting Rod Bolts 0.500 65 88 0.500 65 88 0.500 65 88
43 Piston Assembly Nut 0.750 35 47 0.750 35 47 0.750 35 47
42 Piston Rod Hex Nut 0.500 35 47 0.500 35 47 0.500 35 47
28 Bearing Housing Screws 0.500 55 75 0.375 25 34 0.375 25 34
28 Pinion Housing Screws 0.500 55 75 N/A - - 0.375 25 34
29 Back Cover Bolts 0.500 30 41 0.375 20 27 0.375 20 27
27 Cross Head Set Screw 0.313 10 14 0.313 10 14 0.313 10 14
FLUID END
Item Component L11 & L11 HD L12 L16
No. Description Size Ft-lb (N-m) Size Ft-lb (N-m) Size Ft-lb (N-m)
61 Cylinder Attach/Clamp Nut * 0.625 120 163 0.625 120 163 0.625 120 163
61 Cylinder Attach/Clamp Nut * N/A - - 0.750 200 271 0.750 200 271
53 Valve Cover Nut * 0.500 60 81 0.500 60 81 0.500 60 81
† Cylinder attachment nut torque for L06 HV
* For XYLAN coated studs and nuts use Table 5.
Refer to Figure 3 and Figure 4 for item numbers.
Table 4: Torque Values for Critical Pump Fasteners