ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL
Rev.
7
MM-10-26
Aug
22/16
10-4 Pitch Control Assembly
A. Pitch Control – Removal (See Figure 10-12)
(1)
Disconnect pitch links from pitch link retainer (13).
(2)
Remove tail rotor assembly. (See Section 10-1)
(3)
Remove cotter pin, nut, and pivot bolts from pitch control and control brackets.
(See Figure 10-13)
NOTE:
The stainless steel washers located between control brackets and iolite
bushings of pitch control assembly must be saved for reinstallation.
(4)
Slide pitch control assembly off of chrome sleeve (2).
NOTE:
Seal retainer (3) and seal (4) are damaged on keys each time the pitch
control assembly is removed. Install new seal and retainer on reassembly.
(5)
Remove keys (1).
B. Pitch Control Disassembly (See Figure 10-12)
(1)
Remove seal retainer (3) and seal (4).
(2)
Remove cotter pins (14) from retainer (13).
(3)
Place pitch link retainer (13) in small arbor press and press dowel pin (12)
through retainer and pitch control bearing (5).
(4)
Rotate retainer and repeat on opposite pin.
(5)
Gently press pitch control bearing (5) through pitch link retainer (13), wave
spring washers (11), and bearing (9).
CAUTION:
Use a press tool that exactly fits the bronze pitch control bearing or
damage will occur to the bearing. Heat the bearing housing (7) and
pitch change retainer (12) to 230°F with a heat gun before attempting
to press the pitch control bearing from the bearing housing and the
pitch change retainer.
(6)
Remove snap ring (10).
(7)
Heat bearing housing (8) and gently tap bearing (9) to remove.
(8)
Clean parts for inspection.
(9)
See pages MM-10-28 and MM-10-29 for inspection requirements.
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