IBM Selectric - Preventive Maintenance

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-
justment being incorrect before measurements are
made. The zero adjustment can be made by removing
the two screws that fasten the end cap I 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-
i ng the co liar on its shaft. The hook may have to be
removed from the sca Ie to a Ilow the shaft to move far
enough to expose the Allen screw; however I the hook
shou Id be rep laced when checki n9 the zero adj ustment .
Correct adjustment is checked by holding the scale in
the upright position (hook hanging down) and observ-
i ng that the sca Ie reads exact Iy 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 (Keyboard-
less). The following method of IIcycle
ll
inspection is
recommended. The I/O Pri nter shou Id 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 mechanical check and
adjustment.
1st Inspection -- Cycle Clutch, Tilt Mechanism,
Ribbon Mechanism
2nd
Inspection -- Keyboard Area, Rotate Mechanism,
Detenting
3rd Inspection -- Scoping - Print Magnets, Oper-
ational Magnets, Contacts
4th Inspection -- Operational Area
5·28
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. Operational Cam Bearing.s.
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 special nozzle, 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, shou Id 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 single shift oper-
ation. The following areas are primari Iy affected by
&idling time I since only the operational shaft is driven.
1. Motor and motor pu Iley .
2. Cycle clutch spring and arbor.
3. Driven pu Iley hub and beari ng . *
4. Operational cam bearings.
5. RHoperational shaft and shift cam bearing.
6. Shift clutch arbor and spring.
When power is on 24 hours dai Iy, we recommend
lubri cation of items 1 thru 6 every eight weeks.
Note: Lubrication must be applied judiciously to
eliminate migration or IIspin-offll into electrical con-
tact areas.
IBM No. Part No. Description
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 #10
The above part numbers are avai lable in Mechanics-
burg, and a II EPC's.
* See S . H. 15.7