The gland nut seal is of an “O” - ring design. This seal
keeps the oil from leaking around the gland nut and
cylinder barrel threads.
Certain cylinders have spacers in them. These spacers are
used to limit the stroke of the rod.
Some cylinders also have replaceable hardened bushings
in the pivot areas that can be serviced when worn out.
1-30
HYDRAULIC CYLINDERS 1.4
General Information
All cylinders are a double acting, designed to extend and
retract under pressure.
The piston rods, which are made of high strength
distortion free material, are precision ground and hard
chrome plated. The cylinders barrels are micro honed to
close tolerance,straightness and smooth finish for long
piston packing seal life.
All cylinders have a 2 piece piston assembly made of
ductile iron and a polypac seal arrangement consisting of
a piston seal and 2 wear rings.
The rod seal is a “U” cup design, with the “U” facing the
pressurized oil.The rod wiper keeps foreign matter from
entering the cylinder by wiping the rod clean as the
cylinder retracts.
C1179
15
14
13
1
2
3
4
5
6
7
8
9
10
11
12
1. O-ring 9. Piston part “B” (front)
2. Wiper seal 10 Grease fitting
3. Rod seal 11. Cylinder barrel
4. Gland O-ring 12. Gland nut
5. Wear ring 13. Cylinder rod
6. Piston seal 14. Lock nut
7. Wear ring 15. Grease fitting
8. Piston part “A” (rear)
Lift cylinder shown
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