SINGER 251 - Manual (Page 32)

32
TO REMOVE AND REPLACE THE UPRIGHT ARM SHAFT
(See Fig. 50)
REMOVAL;
If it is found necessary to remove the upright arm
shaft K3, it should be removed in the following
manner;—
1. Remove oil pump, as instructed on page 31.
2. Follow the instructions in Steps 2 and 3 for re­
moval of hook shaft on page 30 except that. In­
stead of removing hook shaft, merely remove
hook shaft bevel gear S4, Fig. 48.
3. Remove arm top cover.
4. Remove screw L3 and oil lead M3.
5. Remove four cap screws N3.
6. Remove oil flow window cap 03, window P3,
oil flow body R3 with two gaskets Q3.
7. Mark the two bevel gears S3, with chalk or cray­
on, on one tooth of one gear and the correspond­
ing space between the teeth of the other gear so
that these gears may be re-assembled in their
original relative positions without difficulty, if
necessary.
8. Loosen set screws T3 in bevel gear at upper end
of upright arm shaft.
9. Make certain bevel gear at lower end of upright
arm shaft is fastened securely. Then while hold­
ing upper bevel gears S3 in mesh, draw upright
arm shaft down and out of machine.
REPLACEMENT;
1. Before installing upright arm shaft, make certain
it has the bevel gear L2, Fig. 48 correctly fastened
at the lower end of shaft.
03 R3 03 P3
Fig. 50, Removing Upright Arm Shaft
2. Insert upright arm shaft up through upper bevel
gear, as shown in Fig. 50.
3. Turn shaft so that one of the two set screws T3
will bear upon the upper gear flat on the shaft
and tighten the set screws T3.
4. Replace and set hook shaft bevel gear as in­
structed in Step 5 on page 30.
5. Replace oil pump, as instructed on page 31.
6. Replace oil flow window assembly, in the order
shown in Fig. 50.
7. Replace oil lead M3 and arm top cover.