Hydac 8302216 Manual

8302216 [Accumulator Test Tool]
Instruction Guide
1404 13th St. South Humboldt, IA 50548 Phone: [phone] www.hy-capacity.com
052019 INST-8302216.DOCX
WARNING!
Never use oxygen or air – this could cause an explosion! Use dry nitrogen or other
recommended gases.
Preparation
To check the gas precharge pressure in an accumulator, it must first be
isolated from the system shut off, and all hydraulic pressure relieved.
HYDAC Gas Valve Version 1 (see Fig. 2)
Unscrew the valve protection cap. Slightly loosen the socket head cap
screw with an Allen wrench (approx. 1/6 turn, see Fig. 2).
FPK Unit
Prior to connecting the charging and gauging unit to an accumulator,
close manual bleed valve by hand tightening. Connect the unit to the
accumulator by screwing cap nut onto HYDAC gas valve version 1;
hand tighten (see Fig. 1).
Checking Gas Precharge Pressure
Connect the appropriate charging and gauging unit to the
accumulator following the instructions under “Preparation”.
FPK Unit
Turn T-handle counter clockwise a maximum of 3 full turns. The gauge
needle should indicate the existing gas precharge pressure. If there is
no gas precharge pressure indicated or if it is too low or too high,
please follow instructions under the appropriate section, either “Pressure
Release” or “Charging”. If desired gas precharge pressure registers,
please follow the instructions under “Removal of Charging and
Gauging Unit”.
Pressure Release
With the appropriate charging and gauging unit attached as previously
described, gas precharge pressure can be released by carefully
opening manual bleed valve. Release the gas precharge pressure very
slowly until the desired gas precharge pressure is reached (this insures
that the gas temperature does not fluctuate greatly, providing and
accurate gas precharge pressure). Close the manual bleed valve.
Allow the gas precharge pressure to stabilize. (5 to 10 minutes) recheck,
adjust if required. Once the desired gas precharge pressure is reached,
please follow the instructions under “Removal of Charging and
Gauging Unit”.
Charging
HYDAC recommends the use of a pressure regulator on the
commercially available nitrogen bottle to regulate pressure to the
charging and gauging unit.

8302216 [Accumulator Test Tool]
Instruction Guide
1404 13th St. South Humboldt, IA 50548 Phone: [phone] www.hy-capacity.com
052019 INST-8302216.DOCX
Note: Full nitrogen pressure may damage the gauge. Connect the charging hose to a commercially available nitrogen
bottle by means of the G4 adapter (other adapters are available, check with factory for type); the adapter connects to
the cap screw “G1”. Connect cap nut of the charging and gauging unit (see fig. 1). Connect the appropriate charging
and gauging unit to the accumulator by following the instructions previously described.
Initial Charging
When charging an accumulator that has no initial gas precharge, allow 20 to 30 minutes for the gas temperature and thus
pressure to stabilize. Recheck the gas precharge pressure and adjust if necessary.
FPK Unit
Turn T-handle counter clockwise 3 full turns.
Pressure Increase
When charging an accumulator that has an existing gas precharge, allow 5 to 10 minutes for the gas temperature and thus
pressure to stabilize.
FPK Unit
Turn T-handle counter clockwise until the gauge needle begins to deflect, then turn it another full turn.
Filling
Open the shut-off valve on the nitrogen bottle and slowly fill the accumulator with dry nitrogen gas. Precharge very slowly
until the pressure in the accumulator reaches 100 psi. Once 100 psi is reached, the charging rate can increase. Charging
too quickly may damage the accumulator.
Note: The gauge registers the line pressure, not necessarily the accumulator pressure while charging. After allowing the
appropriate time for the gas temperature and thus pressure to stabilize, adjust the gas precharge pressure as required, refer
to “Pressure Increase” or “Pressure Release”.
Once the desired gas precharge pressure is reached close the shutoff valve on the commercially available nitrogen bottle.
Remove the charging and gauging unit from the gas valve as described under “Removal of Charging and Gauging Unit”.
Removal of Charging and Gauging Unit
Close the shut-off valve on the commercially available nitrogen bottle before removing the charging and gauging unit.
FPK Unit
Turn T-handle clockwise until resistance is felt to close the socket head cap screw, hand tighten. Open manual bleed valve
to relieve pressure in the charging and gauging unit. Proceed to “Disconnecting”.
Disconnection
Unscrew the charging and gauging unit from the gas valve. Note: FPK unit with adapter FPK/SB it may be necessary to
loosen the connection between cap nut and the adapter to remove the charging and gauging unit. Check for leaks. None
are permissible.
Completion
HYDAC Gas Valve Version 1 (see Fig. 1)
Tighten socket head screw cap to 20 Nm (15 lb-ft), and screw on valve protection cap (where applicable); hand tighten.
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