HEADSTOCK BEARING REPLACEMENT
To replace the headstock bearings proceed as follows:
(Refer to sketch, "HEADSTOCK INTERNAL ARRANGEMENT", IM-22-1)
1. Remove spindle flange using special puller as describ.ed in
"Spindle Flange Disassembly and Assembly", IM-20-1 & IM-21-1
2. Remove the bearing cap.
3. Remove pulley and bearing cap at outboard end of spindle.
4. Using a soft-faced hammer, drive the spindle out of the
headstock by tapping on the pulley end of spindle.
5. Remove bearings, clean spindle thoroughly and inspect for any
nicks or burrs. Remove any such imperfections as required.
6. Check spindle for straightness. Check centers for cleanliness;
then hold spindle between centers and check random points on
wheel and bearing seats. Maximum allowable runout at any point
should be .002 TIR.
7. Remove seal from left hand ( wheel end) bearing cap. Clean cap
thoroughly and install a new seal as shown in IM-22-1.
8. Remove seal from right hand (pulley end) bearing cap. On older
type machines the bearing cap pilot is .125 long. On such caps,
the pilot must be machined to .062 long, as shown on IM-22-1
or PGA-1289. Clean cap thoroughly and install seal.
9. Install new bearings on spindle using extreme caution to
prevent entrance of any dirt into the bearings. SEE NOTE AT
END FOR LUBRICATION!
10. Clean bore of headstock thoroughly, lubricate bearing areas
for minimum friction as bearings slide into place.
11. Install spindle assembly in headstock. ( Use STLA-102 )
12. Install a .015 thick shim against face of bearing outer race.
13. Install bearing cap using care to insure that four ( 4) socket
head cap screws are pulled up firmly and uniformly.