Park Tool Co.
5115 Hadley Ave. N., St. Paul, MN 55128 (USA) www.parktool.com
HHP-3 Home Mechanic
Headset Cup Press
PRESSING HEADSET CUPS INTO FRAME
1. Determine the acceptability of the press fit between the headset cup and
the head tube. Using a caliper, measure outside diameter (OD) of pressed
portion of headset cup. Next, measure inside diameter (ID) of frame head
tube. Due to possibility of ID being out of round, measure in at least two
places and average the dimensions. Subtract inside diameter from outside
diameter to determine amount of pressing interference. Normal inter-
ference is between 0.1mm - 0.2mm. If the press fit is more than 0.2mm,
damage to frame and/or tool may occur. In this case, it is recommended
to ream the head tube or find a headset with a different press interference.
If the difference is between 0.0 - 0.1mm, a Loctite-type adhesive is recom-
mended. If the difference is negative, a different headset is recommended.
Check with headset manufacturer for interference specifications unique to
their headset.
2. Assemble HHP-3 and headset parts as seen in Figure 1.
3. Turn handles clockwise slowly and inspect alignment of cups as they enter
head tube. Press cups until fully seated into head tube.
Part No. Description
Qty.
574 Handle Weldment 2
575 Threaded Shaft 1
573 Extension Tube 1
579 Press Disk 2
578 Nylon Washer 2
HHP-3 part numbers
1
2
3
4
5
PRESSING BEARING CUPS INTO ONE-PIECE
BOTTOM BRACKET SHELLS
1. Assemble parts as seen in Figure 2.
2. Turn handle clockwise and press cups until fully seated
into bottom bracket shell.
grease
Figure 1
Figure 2
grease
grease
1
5
4
2
3
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