General Pump MW Repair Manual - Manual (Page 37)

GENERAL PUMP
A member of the Interpump Group
MW/S SERIES
Page 37
Proceed with calibration of the M16 x 180 screws with a torque wrench as indicated in paragraph 3 “Screw
Tightening Calibration”.
Tighten the 8 M16 x 180 screws starting cross-wise from the 4 inner screws, to then
continue with the 4 outer screws, always tightening cross-wise.
Calibrate the M16 x 55 cover screws with a torque wrench as indicated in paragraph 3, “Screw Tightening
Calibration”.
Apply the valve opening devices (1, fig. 132) and screw them in with the use of a 30 mm spanner
(1, fig. 133).
Apply the 1/4” NPT plugs on the front of the head with relative O-rings. Proceed with calibration of the 1“
plugs with a torque wrench as indicated in paragraph 3 “Screw Tightening Calibration”.
2.2.3 Dismantling the MWS45A, MWS50A and MWS55A Head-Valve Units
The head requires preventive maintenance as indicated in the Owner’s Manual. Operations are limited to
inspection or replacement of valves, if necessary. Proceed as follows to extract valve groups:
Unscrew the 8 M16 x 45 screws of the outlet valve cover (1, fig. 134) and remove the cover (1, fig. 135).
Ref 300791 Rev.C
11-12