JLG 4394RT Service Manual - Manual (Page 178)

SECTION 4 - HYDRAULICS
4-12 – JLG Lift – 3121249
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2. Clamp front cover into vise so that the ring groove is
up. Apply a small amount of grease to the seal
groove and install a new seal ring (8) into the
groove.
3. Apply lubriplate or equivalent to outer surface of
drive shaft installation tool. Insert tool (bullet) into
shaft seal from seal ring groove side of front cover.
4. Place a small amount of grease on the seal groove
on the front bearing block (2). Install a new load seal
and anti extrusion seal in the groove. Insert the bear-
ing block into the body, making sure that the load
seal (3) and anti extrusion seal (4) are positioned
properly. Ensure the outside of the "W" seal is
exposed to the discharge pressure.
5. Apply a small amount of grease to the dowel pins (7)
and install the pins into the body (13).
6. Set the body (13) onto the front cover (5), matching
the scribe marks on the body and front cover. The
dowel pins (7) should go into the mating holes on
the front cover (5).
7. Install drive gear (12), and driven gear (11).
8. Place a small amount of grease in the seal groove
on the rear bearing block (2). Install a new load seal
and anti extrusion seal in the groove. Insert the bear-
ing block into the body, making sure that the load
seal and anti extrusion seal are positioned properly.
Ensure the outside of the "W" seal is exposed to the
discharge pressure.
9. Apply a small amount of grease to the seal groove in
the rear cover (6) and install a new seal ring (8) into
the groove. Set the rear cover (6) onto the body (13),
matching the scribes marks on the body and rear
cover.
10. Insert he cap screw (14) and washers (9); torque to
42-46 lb-ft. (57-62 Nm).
11. On models equipped with keyed drive shaft, install
drive key (10).
12. With an adjustable wrench, check that the drive
shaft turns without evidence of a mechanical bind.