Merrow Class 70 - Merrow Class 70 Looper Carrier; Class 70 Looper Carrier Adjustment; Merrow Class 70 Shafts and Cams Removal; Class 70 Shafts and Cams Removal Procedure

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
THE MERROW MACHINE COMPANY
UPPER LOOPER CARRIER ASSEMBLY AND
LOWER LOOPER CARRIER ASSEMBLY
70. The Upper Looper Carrier Assembly is pivoted on the Lower Looper Carrier Assembly.
The Upper and Lower Looper Carrier Assemblies must be perreclly free to travel their full
stroke along the U. L. C. Slide Rod, bul must have little lost motion. The U. L. C. Guide
serves to limit the sidewise motion or the Looper Carriers during their back and forth stroke.
The U. L. C. Guide Shim M-269-2 (round) (2) and U. L. C. Guide Shim M-269-11 (square)
are provided under the points of support of this U. L. C. Guide. All of these Shims are marked
with a number which designates its thickness in inches. Thicker or thinner shims of either
type may be purchased in graduated steps of one-half a thousandth of an inch. When adjusting
the U. L. C. Guide, suitable Shims shou ld be provided under each end of il so that when the
Guide
is securely fastened in place, there will be a uniform opening between this Guide and the
Upper
Looper Carrier of slightly less than one thousandth of an inch.
71. The above mentioned adjustment of the U. L. C. Guide is made at the factory and most
machines run four or five years without readjustment unless there be an accident spoiling one
of the
parts. Whenever any of the parts compiling this assembly are replaced, this adjustment
shou ld be checked.
72. The Cam Rolls for the Upper Looper Carrier Assembly are identical. If excessive up and
down looseness of the Loopers develops, these Cam Rolls may need replacing which is simply
accomplished by removal of the Frame Cap Assembly.
TO REMOVE THE UPPER AND LOWER SHAFTS AND CAMS
73. In order to remove the Main Shafts, proceed as follows:
20
NOTE: It is unnecessary to drain the oil from tile machine.
a. After swinging the Presser Foot Assembly out of the way for accessibility, remove
the Needle Plate, and Lower Looper Thread Tube from the Machine.
b. Remove
the F. E. Nut 2-3/16 and the F. C. L. (r) Nut 2-3/16 . Then remove the Feed
Carrier Link (r) and the Feed Eccentrics.
c. To remove the Work Plate Support take out the two Screws 52-3/16 which hold the
Work
Plate Support to the Frame.
d. Slide the Feed Carriers from the F. R. Eccentric Block and the F. C. Block and
remove the Blocks.
e. Remove the Needle Carrier Stud after loosening the Set Screw 8-7/32. Slide the
Needle
Carrier Assembly and the N. C. Link Assembly from the machine.
f. Remove the Frame Cap Assembly as d escribed previously.
g. To remove the Upper Shaft Assembly and Upper Cam, proceed as follows:
1. Remove the Upper Shaft Pump Parts (Screw 8-7/16, Spring 27-40, and Oil Pump
Plunger). Care must be taken not to harm the 0. P. P. Screw Casket.
2. Loosen Screw 5-9/32 and remove F.C. Oil Feeder Tube Assembly, M-95-
Assy. -4. Note: When replacing this part, point projection on this tube downward.