General Pump MW Repair Manual - Manual (Page 27)

GENERAL PUMP
A member of the Interpump Group
MW/S SERIES
Page 27
2.2 Repairing Hydraulic Parts
2.2.1 Dismantling the MW32A, MWS36A, MWS40A Head-Valve Units
The head requires preventive maintenance as indicated in the use and maintenance manual. Operations
are limited to inspection or replacement of valves, if necessary. Proceed as follows to extract valve groups:
Unscrew the 8 M16 x 55 screws of the valve cover (1, fig. 95) and remove the cover (1, fig. 96).
2.1.3 Increase and Reduction Classes
TABLE OF REDUCTIONS FOR CRANKSHAFTS AND CON-ROD HALF-BEARINGS
Recovery classes
(mm)
P/N
Half-bearing
Upper
P/N
Half-bearing
Lower
Correction on the shaft pin
diameter
(mm)
0.25 F90928100 F90928400 Ø79.75 0/0.02 Ra 0.4 Rt 3.5
0.50 F90928200 F90928500 Ø79.50 0/0.02 Ra 0.4 Rt 3.5
INCREASE TABLE FOR PUMP CASING AND PLUNGER GUIDE
Recovery classes
(mm)
P/N
Plunger Guide
Adjustments on the Pump
Casing housing
(mm)
1.00 F73050243 Ø71 H6 +0.019/0 Ra 0.8 Rt 6
Ref 300791 Rev.C
11-12