Oshkosh JLG 1500SJ, Руководство по обслуживанию и ремонту

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SECTION 5 - BASIC HYDRAULIC INFORMATION & HYDRAULIC SCHEMATICS
3121262 – JLG Lift – 5-95
ASSEMBLY
NOTE: Refer to Figure 5-115. and Figure 5-116. provided at the end
of this procedure for the proper seal locations and orienta-
tions. Improper seal orientation
will compromise perfor-
mance!
Inspect all components per above INSPECTION procedure.
Clean all components with a lint-free cloth. The barrel should
be flushed out and drained. Compressed air may be used to
blow out the barrel bore and all ports. Lubricate all seals with
hydraulic fluid prior to assembly.
HEAD GLAND ASSEMBLY
1. Install rod seal; refer to Seal Detail for proper orientation.
2. Install wear rings.
3. Press in the rod wiper using a soft metal (brass or alumi-
num) or nylon tool which contacts the wiper 360°. Make
sure the wiper remains perpendicular to the bore at all
times.
4. Install the backup ring and o-ring with the backup ring
nearest the head gland flange.
PISTON ASSEMBLY
1. Install o-ring into groove in I.D. of piston.
2. Install one wear ring onto piston.
3. Install piston seal into central groove on piston O.D. A
clean, small cross-section o-ring or a thin elastic band
may be wrapped around seal to help stretch it over pis-
ton.
4. Install remaining wear ring.
ROD, GLAND, PISTON ASSEMBLY
1. Lubricate I.D. of head gland assembly with hydraulic
fluid, and slide onto rod (rod wiper end first) using cau-
tion not to damage rod wiper or seal on rod end.
2. Slide stop tube (with o-ring) onto rod. Do not scratch
rod chrome.
3. For pistons with threaded I.D., apply Loctite #7471
(Primer-T) to piston and rod threads. Allow primer to
evaporate then apply two beads of Loctite #222 Thread
Adhesive axially across the threads of the piston I.D.
4. Install piston assembly onto threaded end of rod.
Tighten piston onto rod end to 100 ft.lbs. An optional
method for tightening threaded piston is to turn until
piston bottoms out; then set in place by hitting spanner
wrench handle with a hammer; piston should rotate
slightly while setting.
FINAL ASSEMBLY
1. Make sure all rags, etc. are removed from barrel bore.
Lubricate barrel bore and piston assembly with hydrau-
lic fluid. Avoid getting any oil in barrel threads.
2. Place pad support on rod assembly before installing into
barrel. Use care to avoid damaging wear rings, seals, and
rod chrome.
3. Align rod with barrel assembly. Insert piston into barrel
opening. Use care to avoid damaging wear rings, seals,
and piston surface on barrel.
4. Lubricate o-ring and backup on head gland using
hydraulic fluid.
5. Align head gland with barrel assembly, position pad
support over head gland (avoid damaging the o-ring
and back-up with the pad support), and press head
gland into barrel assembly.
6. Apply a bead of Loctite #222 Thread Adhesive axially
cap screw threads.
7. Screw cap screws into head gland / barrel assembly and
torque to 20 ft.lbs. (27 Nm).