Section 22E
Section 22E
AccumulatorAccumulator
Introduction.Introduction. The accumulator acts as a shockThe accumulator acts as a shock
absorber in absorber in the hydraulic the hydraulic system. system. When the When the driv-driv-
en member of the hydraulic system stops sudden-en member of the hydraulic system stops sudden-
ly, it creates a pressure wave that travels backly, it creates a pressure wave that travels back
through the sthrough the system. ystem. This shock This shock wave can wave can devel-devel-
op peak pressures several times greater than nor-op peak pressures several times greater than nor-
mal working pressures and can be the source ofmal working pressures and can be the source of
system failure. system failure. The gas The gas cushion in cushion in an accumula-an accumula-
tor will minimize this shock, protecting expensivetor will minimize this shock, protecting expensive
hydraulic components.hydraulic components.
Accumulators.Accumulators. There There are tware two aco accumulatorscumulators
connected to connected to the manifold the manifold valve. valve. They store They store aa
volume of oil at pressure for brake application.volume of oil at pressure for brake application.
These accumulators are hydro-pneumatic pistonThese accumulators are hydro-pneumatic piston
type and are precharged with dry nitrogen totype and are precharged with dry nitrogen to
1,250 psi (86 bar) and 500 psi (35 bar).1,250 psi (86 bar) and 500 psi (35 bar).
Checking Precharge.Checking Precharge. The precharge checkThe precharge check
should be performed periodically (refer to theshould be performed periodically (refer to the
Preventive MaintenancePreventive Maintenancechart in thechart in the Appen-Appen-
dicesdicesfor for precharge check precharge check interval). interval). Follow theFollow the
procedures listed below to check precharge (aprocedures listed below to check precharge (a
charging kit is charging kit is available from Tayavailable from Taylor, part numberlor, part number
1000-503). 1000-503). See Illustration See Illustration 22E-1 for 22E-1 for charging kit.charging kit.
1.1. TTo read ao read and adjnd adjust tust the gas phe gas presressursure or “pree or “pre--
charge” pressure, all the hydraulic fluid mustcharge” pressure, all the hydraulic fluid must
be drained from the fluid side of the accumula-be drained from the fluid side of the accumula-
tor to zero hydraulic tor to zero hydraulic pressure. pressure. TTo accomplisho accomplish
this, let the lift cylinder down and hold lever inthis, let the lift cylinder down and hold lever in
DOWN position for approximately one minute.DOWN position for approximately one minute.
2.2. RemRemove tove the vhe valvalve guae guard anrd and cap d cap frofrom them the
accumulator.accumulator.
3.3. EnsEnsure ture that that the shhe shaft oaft of the aif the air chur chuck (4ck (4) is) is
fully retracted by turning the bar handle coun-fully retracted by turning the bar handle coun-
terclockwise until it stops.terclockwise until it stops.
4.4. Do noDo not havt have the ce the charharging hging hose (ose (8) co8) connennectectedd
Charging The AccumulatorCharging The Accumulator (Illustration 22E-1)(Illustration 22E-1)..
Perform the following procedures to charge thePerform the following procedures to charge the
accumulator.accumulator.
Use only dUse only dry nitrogen ry nitrogen to charge to charge thethe
accumulator.accumulator.
When prechargiWhen precharging, the ining, the initial 50 psi tial 50 psi (3.5 bar)(3.5 bar)
of dry nitrogen should be of dry nitrogen should be introduced slowlyintroduced slowly
into the into the accumulatoraccumulator..
1.1. InstaInstall tll the che charginharging kit g kit (Illu(Illustratstration 2ion 22E-1) 2E-1) asas
explained in theexplained in the Checking PrechargeChecking Prechargeproce-proce-
dures above.dures above.
2.2. ConConnecnect the cht the chargarging kiing kit to a nitt to a nitrogrogen boten bottletle
with the charging hose (8).with the charging hose (8).
3.3. InfInflatlate the acce the accumuumulatlator to the pror to the predetedetermermineinedd
pressure by opening the valve on the nitrogenpressure by opening the valve on the nitrogen
bottle slowly, closing it occasionally to allowbottle slowly, closing it occasionally to allow
the needle of the pressure gauge (2) to settlethe needle of the pressure gauge (2) to settle
into position giving an accurate pressure read-into position giving an accurate pressure read-
ing.ing.
4.4. WheWhen thn the proe proper pper precrecharharge prge pressessure iure iss
reached, close the valve on the nitrogenreached, close the valve on the nitrogen
bottle.bottle.
5.5. TTo relo release ease presspressure in ure in excesexcess of s of the dthe desiredesired
precharge, slowly open the bleeder valve (6)precharge, slowly open the bleeder valve (6)
until the pressure drops to the desired level.until the pressure drops to the desired level.
6.6. RotRotate thate the bar hane bar handle codle countuntercercloclockwikwise to thse to thee
full stop position, then disconnect the swivelfull stop position, then disconnect the swivel
(7) from the adapter (3).(7) from the adapter (3).
7.7. RemRemove tove the air che air chuchuck (4) frk (4) from thom the acce accumuumula-la-
tor valve stem.tor valve stem.
88 CheCheck tck the vahe valve slve stem ftem for leor leaks waks with a sith a soapoapyy
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