JLG 340AJ, Service And Maintenance Manual

Page: 146 / 370

SECTION 4 - BOOM & PLATFORM
4-12 – JLG Lift – 3121259
Disassembly
Inspect the actuator for corrosion prior to disassembly. Severe
corrosion can make it difficult to remove the lock pins (109)
and unthread the end cap (04). If corrosion is evident, soak the
lock pins and end cap with penetrating oil for several hours
before disassembling.
Disassembly is easier if the actuator is firmly secured to a work
bench. A pipe vise or mounting fixture works well for this pur-
pose.
1. Remove port plugs (106.1) (106.2) and drain oil. Inspect
oil for signs of contamination, i.e. water, metal shavings.
2. Remove the cap screws (113) that cover the end cap lock
pins (109).
3. Using a 1/8" (3 mm) drill bit, drill a hole in the center of
each lock pin to a depth of approximately 3/16" (5 mm).
4. Remove the lock pins using a screw extracting tool such
as an "Easy Out" (a size #2 is shown).
If the pin cannot be removed with the screw extractor,
use a 5/16" bit to drill out the entire pin. Do not drill
deeper than 1/2" (12.7 mm).
5. Install the end cap removal tools provided with the seal
kit. (1/4-20)
6. Using a metal bar or similar tool, unthread the end cap
(4) by turning it counterclockwise.