Page 6 Section 6
Scheduled Maintenance
MSD 7R SHEARS
MAIN PIVOT GROUP
See fi gure 6-9. The main pivot group of your shear is a high-tolerance area requiring regular lubrication. The
thrust washers in the main pivot are considered wear parts that will have to be replaced when worn.
1.
Use a feeler gauge to check between the thrust washer and the upper shear. If .030” or more gap is pres-
ent the thrust washers may need to be replaced.
2.
To replace the thrust washers, it will be necessary to place the upper shear in a horizontal position.
3.
Loosen the set screw in the main pin locknut and remove the locknut.
4.
Place a chain around each end of the upper shear to an overhead hoist or forklift. Put some type of protec-
tion between the chain and the blades on the upper.
5.
Raise the upper evenly with the hoist, just enough to take the pressure off the pin. Remove pin and thrust
washers.
6.
The thrust washers will have to be replaced as a set, both right and left sides. The thrust washers will
come stamped, LH (left-hand) and RH (right-hand) for the correct side.
7.
Reinstall the pin, placing the appropriate new thrust washers in place as the pin is put in place.
8.
Cycle the shear slowly, making sure there is no interference in the blades. Check the blade gap to deter-
mine if any adjustments are required.
FIGURE 6-9
MAIN PIN
THRUST WASHER
THRUST WASHER
SET SCREW
LOCK NUT
