HYDAC SB 600 - Manual (Page 7)

INNOVATIVE FLUID POWER 29
PN#02073469 / 07.14 / ACU1102-1326
Maintenance
5. Top Repairable Bladder Accumulators
Top repairable accumulators may also be repaired from the bottom (fluid) side.
For this procedure please see section 3.
5.1 Disassembly
A Relieve system fluid pressure and drain all fluid from accumulator.
Remove
valve protection cap (item 6) (if applicable) and unscrew valve seal cap (item 5).
Attach proper HYDAC Charging and Gauging Unit (FPK with adapter FPK/SB) and completely
relieve the gas precharge pressure (refer to HYDAC Charging and Gauging brochure #02068202) .
B Remove gas valve core (item 3) by using the gas valve core tool. Thread pull rod onto gas
valve and hold to keep gas port from falling into shell.
C Unscrew gas port lock nut (item 31) using spanner wrench. Remove spacer ring (item 17) .
If necessary, tap spacer ring with a plastic hammer to loosen. Push gas port adapter into
shell.
D Remove back-up ring (item 30) , O-ring (item 29) , and flat ring (item 28) before removing
anti-extrusion ring. Remove anti-extrusion ring (item 24) from gas port adapter, then fold it
in half to pull it through the gas side opening.
E Pull gas port adapter through gas side opening and grasp the gas port adapter with one
hand, while removing the pull rod with the other.
Remove the gas port/bladder assembly (item 22 and 2) from the shell. It may be necessary
to fold the bladder lengthwise to remove it.
F Remove bladder stem lock nut (item 4) from gas valve and separate gas port adapter
(item 22) from bladder (item 2) .
5.2 Inspection of Components
Shell:
• inside to ensure it is free of debris, rough spots, or chafe marks.
• fluid side and gas side bores for damage which could hamper proper sealing.
• exterior for any sign of damage.
If any interior or exterior damage is found, contact HYDAC for proper repair or
replacement instructions.
Bladder:
The bladder must be checked for leakage. Reinstall gas valve core (item 3) and charge the
bladder with nitrogen or compressed air to its natural shape and inspect for leakage.
If leakage occurs, first check the gas valve core
(item 3) and replace it if necessary. If leakage
still occurs, then the bladder must be replaced. The bladder must be visually inspected for
lateral grooves and deep chafe marks. If any are found, the bladder should be replaced.
Shallow chafe marks are insignificant and will not hamper performance.
Note: Bladders can not be repaired or revulcanized.
Fluid Port:
Depress poppet and rotate 90° to ensure free movement. Visually inspect poppet, threads,
and sealing surfaces for any damage. If any damage is found, the fluid port should be
replaced.
Vulcanized Anti-extrusion Ring:
Visually check vulcanized area between steel and rubber to make sure it is undamaged and
that adhesion is still good (no gaps between rubber and metal) . If the adhesion is poor or the
rubber is cracked or shows signs of embrittlement or aging, replace anti-extrusion ring. Also
check the seat area on the steel parts for grooves or any other damage. If any are found
replace anti-extrusion ring.
Non-Vulcanized Anti-extrusion Ring:
Visually inspect area between the steel and rubber to make sure that the steel ring is properly
seated. If the rubber is cracked or shows signs of embrittlement or aging, replace anti-
extrusion ring. Also check the seat area on the steel parts for grooves or any other damage.
If any are found replace anti-extrusion ring.
Gas Porter Adapter:
Visually inspect the threads and sealing surfaces of the gas port adapter for signs of damage.
If any damage is found, the gas port adapter should be repaced.
Seals:
New seals should always be used whenever reassembling any bladder accumulator.
Other Parts:
Inspect for damage and replace if necessary.
A
E
D
C
B
F