Use Of Head Cam Alignment Tool - HP 7925D Service Manual

Removal and Replacement
INSTRUCTIONS
7925
REF 7311·56
LOOSEN KNURLED SCREWS
SLIDE ALIGNMENT TOOL ONTO SPINDLE HUB
ENSURE THAT ALIGNMENT TOOL BUTTS UP AGAINST CAMS
SECURE ALIGNMENT TOOL ON SPINDLE HUB, USING KNURLED SCREW
Figure 5-4. Use of Head Cam Alignment Tool
d. Remove the front frame assembly. (Refer to para-
graph 5-7.) Remove the pack chamber assembly. (Re-
fer to paragraph 5-9.) Remove the data heads and the
servo head. (Refer to paragraph 5-18.)
e. Remove the two screws (12, figure 6-7) which secure
the head cam to the head cam support.
f. Remove the two screws (15) which secure the head
cam support (14) to the magnet and rail assembly (28,
figure 6-7).
g. Install the new head cam support (14) using the two
screws (15) and the lockwashers, ensuring that the
support is pushed forward firmly against the stop on
the lower beam (toward the crash stops).
h. Install the head cam (11) on the head cam support by
loosely tightening the two head cam screws (12) and
washers (13).
5-12
i. Loosen the two screws (12) on the other head cam (11).
j. Install the head cam alignment tool, part no. 13354-
60001, on the spindle hub. (See figure 5-4.) Ensure
that the head cams mate with the head cam align-
ment tool.
k. Adjust the cams to position with the head cam align-
ment tool. (See figure 5-5.)
1.
Tighten the cam securing screws (12) to 7 inch-pounds.
m. Remove the head cam alignment tool. Replace the
data heads and the servo head. (Refer to paragraph
5-18.)
n. Replace the pack chamber assembly (refer to
paragraph 5-9) and then replace the front frame as-
sembly (refer to paragraph 5-7),