20-26
®
HYDRAULIC CYLINDER MAINTENANCE
Hydraulic cylinders provide force used to operate booms, attachment, and stabilizers.
Proper
maintenance of cylinders will promote long life and smooth operation. Inspect cylinders daily for leaks or
damage and repair or replace as necessary. Lubricate cylinder grease fittings daily.
See Fig-1
for a typical
high pressure cylinder breakdown and gland bolts torque pattern.
1. Remove cylinder from the machine.
2. Remove the bolts/screws from the gland. Some
cylinders have screw-on gland caps, held in
place with an allen head set screw. If so, remove
set screw and then removing gland cap using an
adjustable chain wrench.
3. Remove hydraulic supply and return lines
(including load lock valves if applicable) from
cylinder to allow free movement of rod.
4. Remove rod assembly from the cylinder barrel.
5. Unscrew the nut from the piston end of the rod
and remove the piston and gland.
6. Before removing old seals, note position they
are in for proper reassembly (see diagram on
next page).
7. Clean and inspect all parts. If worn or damaged,
replace them.
CYLINDER SERVICING & RE-SEAILING
(Cylinder shown may not be type used on your machine but is shown as a reference.)
BARREL
BARREL
BARREL
BARREL
BARREL
(butt & tube assy)
BUSHING
BUSHING
BUSHING
BUSHING
BUSHING
N U T
N U T
N U T
N U T
N U T
ROD
ROD
ROD
ROD
ROD
BUSHING
BUSHING
BUSHING
BUSHING
BUSHING
GLAND
GLAND
GLAND
GLAND
GLAND
PISTON
PISTON
PISTON
PISTON
PISTON
GREASE FITTING
GREASE FITTING
GREASE FITTING
GREASE FITTING
GREASE FITTING
HEX HEAD CAP
HEX HEAD CAP
HEX HEAD CAP
HEX HEAD CAP
HEX HEAD CAP
SCREWS
SCREWS
SCREWS
SCREWS
SCREWS
STROKE
STROKE
STROKE
STROKE
STROKE
LIMITER
LIMITER
LIMITER
LIMITER
LIMITER
GREASE FITTING
GREASE FITTING
GREASE FITTING
GREASE FITTING
GREASE FITTING
10 Bolt Torque Pattern
1
6
2
3
4
8 Bolt Torque Pattern
5
1
6
2
3
4
6 Bolt Torque Pattern
5
7
8
1
6
2
3
4
5
7
8
9
10
Fig-1
Fig-2
SEAL-PISTON
WEAR RING
WEAR RING
O-RING
WEAR RING
WEAR RING
SEAL
SEAL- ROD
WIPER
BACK-UP RING
O-RING
Piston
Gland
SQUARE RING
ROD BUFFER
BACK-UP
RING
05/30/2019
Updated
SERVICE
Содержание 830B
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