13
The accumulator (Q) charge is directed through
the pilot operated directional valve (H) then into
the swingtube-actuating cylinder. (R) The pilot
operated directional Valve is controlled by pilot
oil from the solenoid operated pilot control valve
(G), The solenoid operated pilot control valve is
controlled by the PLC.
The 2nd stage of the tandem gear pump (N)
powers the Remixer motor (S) and/or the jack
stands. (T) The oil from this pump (N) is directed
through the hand operated triple spool valve
with a built-in relief valve (U) then to the Remixer
motor (S) and/or the jack stands. (T) The oil is then
routed to the hydraulic fluid storage tank through
the oil cooler and the 10-micron filter.
The system has two electrically powered
proximity sensors* (V) that send a signal to the
PLC when the cylinder piston has reached the
end of its stroke. The PLC also receives signals
from the operator control panel. The PLC then
automatically controls the switching of the
solenoid operated pilot cycle valve (A) and the
solenoid operated pilot control valve (G) to pump
a smooth flow of concrete in forward or reverse
depending on the operators input.
Valves
Setting the main relief valve 83301 (Sun RPGC-
FCN):
• Loosen locking nut with a 9/16” wrench.
• Turn adjuster all the way out.
• Start engine, place in pressure test mode, turn
pump on and observe main hydraulic pressure
gauge.
• Turn adjuster in until the pressure gauge stops
climbing. (It should stop climbing when it reaches
the pump setting at 3800 psi.)
• Turn adjuster In an additional 1/2 turn and
tighten locking nut.
Setting the Unloader/Check valve 83410 (Sun
QCDB-LAN) and the Unloader/Relief valve. 83411
(Sun RVCA-LAN):
• Loosen locking nuts with a 9/16” wrench.
• Screw top valve (Unloader/Check-83410)
adjuster all the way in using a 3/16” hex key.
• Screw the bottom valve (Unloader/Relief-83411)
adjuster all the way out.
• Start engine and observe accumulator pressure
gauge.
• Screw the bottom valve (Unloader/Relief)
adjuster in until the accumulator gauge reads
2200~2500 psi.
• Screw the top valve (Unloader/Check) adjuster
out until the pump unloads then turn out an
additional 1/4 turn. You can tell when the pump
unloads by three ways:
a) Listening for a slight clicking noise in the
Unloader/Relief valve.
b) Hearing the engine work less.
c) Seeing the accumulator charge hose relax.
• If you have difficulty determining when the pump
unloads, place a 4000# gauge in-line at the pump
output. When the pump unloads the gauge will
drop from 2500 psi to near 0 psi.
• Tighten locking nuts.
• Test operation by shifting S-Tube with
the Forward/Reverse switch and observing
Accumulator gauge. The pump should promptly
charge the Accumulator to 2300~2500 psi and
then unload.
Accumulator
WARNING
Use dry nitrogen gas only to pressurize the
accumulator bladder. NEVER use compressed air.
The use of compressed air or any other unstable
gas can cause a fire or explosion resulting in
serious injury or death.
An accumulator stores hydraulic pressure. This
hydraulic pressure is potential energy since it can
change to kinetic energy.
The Warrior Shotcrete Pump is equipped with a 1
gallon bladder type accumulator (83500) rated @
5000 psi maximum.
A bladder type accumulator consists of a synthetic
rubber bladder inside a metal shell: the bladder
contains the nitrogen gas. As hydraulic fluid enters
the shell, gas in the bladder is compressed. Gas
pressure decreases as fluid flows from the shell.
When all fluid has been discharged, gas pressure
attempts to push the bladder through the outlet.
But, as the bladder contacts the poppet valve at
the outlet, flow from the shell is automatically shut
off.
Since the charged accumulator is a source of
hydraulic potential energy, stored energy of an
accumulator can be used to develop system
flow when system demand is greater than
To Next Page
Loading...