Preventive Maintenance - IBM Selectric Maintenance Manual

22.1 SPRING SCALE - ZERO CALIBRATION
Many adjustments made in the field require the use of
spring scale, PN 9900012. Reports indicate that the
accuracy of the scale is impaired due to the zero ad-
lustment celng
I
ncorrect before measurements are
made. The zero adjustment can be made by removing
the two screws that fasten the end cap, and removing
the end cap. This exposes an adjustable collar se-
cured by a #4 Allen screw. The zero adjustment can
be made by loosening the Allen screw and reposition-
ing the collar on its shaft. The hook may have to be
removed from the scale to allow the shaft to move far
enough to expose the Allen screw; however, the hook
should be replaced when checking the zero adjustment.
Correct adjustment is checked by holding the scale in
the upright position (hook hanging down) and observ-
ing that the scale reads exactly
o.
~
______ Allen Set Screw
Figure 22.0
PREVENTIVE MAINTENANCE
23.0 Preventive Maintenance
For complete PM procedures see the Reference Man-
ual #225-1726 (Keyboard) and #255-3207 (Keyooard-
less). The following method of "cycle" inspection is
recommended. The I/O Printer should be PM'd four
times a year for sing Ie shift operation. The frequency
should be increased in direct proportion to shift usage.
Each inspection should include a complete lubrication
as outlined in the Reference Manual. Each inspection
should cover a different area of
mech~riical
check and
adjustment.
1st Inspection -- Cyc Ie Clutch, Ti It Mechanism,
Ribbon Mechanism
2nd Inspection -- Keyboard Area, Rotate Mechanism,
Detenting
3rd Inspection -- Scoping - Print Magnets, Oper-
ational Magnets, Contacts
4th Inspection -- Operational Area
23.1 The following items require special attention:
a • Motor and Motor Pu Iley •
b. Cycle Clutch Spring and Arbor.
c. Driven pulley hub and bearing.
d • 0peratfontrl-EtirrrB-earmgs.
e. Operational Shaft and Shift Cam Bearings.
f. Shift Clutch Spring and Arbor.
These items should be lubricated every 8 weeks for
shift usage.
23.2 LUBRICATION
Two new lubri cants have been re leased to rep lace a II
present lubricants for the SELECTRIC I/O Printer.
The first new lubricant is IBM #23. This wi II be sup-
plied in 1/2 ounce tubes and in 1 lb. cans. It should
be used wherever Si I-X or a grease was previously
recommended. In most cases the IBM #23 in the 1 lb.
can should be used in conjunction with the grease gun,
PN 158645, and the speci a I nozz Ie, PN 450813.
Don't forget to use this special nozzle on the cycle
clutch grease hole located between the negative 5
cam and the RH positive cam.
The second new lubricant, IBM #10, should be used
wherever an ET #6 or IBM #9 oi I was previously spec-
ified.
The new IBM #10 oi I can be identified by a red cap
on the cam.
The new IBM #23 grease can be identified by the cap
on the 1/2 oz. tube and the one pound can wi II be
clearly marked IBM #23.
Machines with high shift usage require more frequent
lubrication than machines used for sing Ie shift oper-
ation. The following areas are primarily affected by
-idling time, since only the operational shaft is driven.
1. Motor and motor pu Iley .
2. Cycle clutch spring and arbor.
3. Driven pu lIey hub and bearing.
*
4. Operati ona I cam beari ngs .
5. RH operational shaft and shift cam bearing.
6. Shift clutch arbor and spring.
When power is on 24 hours dai Iy, we recommend
lubrication of items 1 thru 6 every eight weeks.
Note: Lubrication must be applied judiciously to
eliminate migration or "spin-off" into electrical con-
tact areas.
IBM No. Part No. Descripti on
23 1280441 1/2 oz. tube - IBM #23
23 1280442
1 lb. can - IBM #23
10 1280443 4 oz. can - IBM #10
10
1280444 1 pt. can - IBM # 1 0
The above part numbers are avai lable in Mechanics-
burg, and all EPC's.
*
See S.H. 15.7
4-28