5
918 series Powerig Hydraulic Units (HK786
)
918 series Powerigs are intended for use in
indoor factory environments. If used outdoors,
they must be protected from the elements.
SYSTEMS:
918: Two (2) open-center circuits with 8,400 psi (580 BAR)
maximum operating pressure
918-5: Three (3) open-center circuits with 8,400 psi (580 BAR)
maximum operating pressure
POWER SOURCE:
10 HP (7.46 kw) Reuland electric motor 220 VAC (27.6A),
440 VAC (13.8A), or 550 VAC (10.8A), 3 phase; 60 Hertz; or
8.3 HP (6.19 kw) Reuland electric motor 380 VAC (13A), 3
phase; 50 Hertz. For other voltages and frequencies, contact
Alcoa Fastening Systems & Rings, Fasteners Division, Kingston
Operations.
PUMP:
Dynex/Rivet constant-displacement hydraulic piston
pump, direct mounted to motor. Pump has six axial pistons.
Flow is split: 3 pistons per circuit in 918; 2 pistons per circuit
in 918-5
FLUID CONTROL:
Four-way solenoid-operated directional
valve, pressure relief valve, and idler valve on each circuit.
RESERVOIR CAPACITY:
22.0 gallons (83.28 liters) center of sight gauge
COOLER:
Fan and radiator air/oil heat exchanger
REMOTE CONTROL:
24 volt AC control circuit
OUTPUT PRESSURE:
PULL range: 5,800–8,400 psi (400–580 bar)
RETURN range: 800–7,000 psi (55–482 bar)
MAX FLOW RATE:
918: 2.0 gpm (7.6 l/m) per circuit
918-5: 1.33 gpm (5.0 l/m) per circuit
MAX OPERATING TEMP:
125° F (51.7° C)
HOSE KITS:
Use only genuine Huck Hose Kits rated @ 10,000
psi (689.5 BAR) working pressure.
HYDRAULIC FLUID:
Hydraulic fluid shall meet DEXRON
®
III, DEXRON VI,
MERCON
®
, Allison C-4 or equivalent Automatic Transmission
Fluid (ATF) specifications. Fire-resistant fluid may be used
if it is an ester-based fluid such as Quintolubric
®
HFD or
equivalent. Water-based fluid shall NOT be used as serious
damage to equipment will occur.
DEXRON is a registered trademark of General Motors Corp.
MERCON is a registered trademark of Ford Motor Corp.
Quintolubric is a registered trademark of Quaker Chemical Corp.
Specifications
NOTE: The units are shipped without hydraulic fluid.
CSA CERTIFIED
UNIT
WIDTH
inch (cm)
LENGTH
inch (cm)
HEIGHT
inch (cm)
WEIGHT
lbs. (kg)
OPERATIONAL
WEIGHT
lbs. (kg)
918
25.0 (
63.5
) 44.0 (
111.8
) 30.0 (
76.2
) 585 (
265
)
708 (
321
)
918-5
29.0 (
73.7
) 44.0 (
111.8
) 30.0 (
76.2
) 601 (
272
)
724 (
328
)
Principle of Operation
See Figures 3 and 4,
E
lEctrical
S
chEmaticS
, and Figure
5,
h
ydraulic
d
iagram
. With the disconnect switch ON,
input power is supplied to open motor contacts and to
the transformer which develops 110 volts AC across its
secondary.
When the START button is momentarily pressed, the circuit is
completed through the motor contact, closing the contacts
and starting the motor. The START button is now bypassed
by a closed motor contact and the motor continues to run
when the START button is released, unless the STOP button is
pressed or the overload relay in the motor contact opens due
to motor overload.
After the START button is pressed, 24 volts AC is developed
across the secondary of transformer for the tool control
circuits. When tool trigger 1 is pressed, relay 1CR energizes,
closing its contacts in the operating solenoid circuit. This
action energizes the solenoid, changing the position of the
directional valve spool so that high-pressure hydraulic fluid is
directed out the PULL pressure port and hose to Tool 1.
When the tool trigger is released, the solenoid de-energizes
and the valve spool returns to its original position, directing
the hydraulic fluid out the RETURN pressure port and hose
to the tool. Each tool has a control circuit that allows it to
operate simultaneously and independently.
Summary of Contents for 918 Series
Page 2: ...2 918 series Powerig Hydraulic Units HK786 ...
Page 14: ...14 918 series Powerig Hydraulic Units HK786 918 918 5 Hydraulic Diagram Figure 5 ...
Page 15: ...15 918 series Powerig Hydraulic Units HK786 Typical Hose and Control Cord Hook up Figure 6 ...
Page 22: ...22 918 series Powerig Hydraulic Units HK786 Electrical Control Panel Wiring Figure 13 ...
