7
507 Hydraulic Installation Tool
(HK480)
Alcoa Fastening Systems & Rings
P
RINCIPLE
OF
O
PERATION
Piston
Relief Valve
Trigger
Ejector Rod
Hydraulic Hoses
to Powerig
When tool hoses and cord are connected to POWERIG
hoses and control cord, PULL and RETURN strokes of
tool are controlled by a
Trigger
in the handle.
When the trigger is pressed, a solenoid-operated valve
in the POWERIG directs pressured fl uid through the
FILL
Hydraulic Hose
to the front side of piston, and
allows fl uid on the RETURN side to fl ow back to tank.
The piston and nose assembly collet moves rearward
causing follower O-rings and/or spring to impart a
forward motion to the follower.
If tool and nose assembly is in position on a fastener pin
and collar, this forward motion causes the jaws to clamp
onto pintail of fastener and installation cycle begins.
Clamping pressure is applied to the sheets. The anvil is
forced forward, swaging the collar into locking grooves
of the fastener.When the anvil hits the sheet, continued
pull causes the pintail to break off. When the
Piston
reaches the end of its PULL stroke, it uncovers fl ats
on the rear end of the
Relief Valve
. These fl ats were
designed to provide a passage for hydraulic fl uid from
PULL side to RETURN side of piston, “unloading”
(“dumping”) the pressurized fl uid back to tank.
When the trigger is released, the solenoid is
de-energized and the valve directs pressurized fl uid to
rear side of the piston and allows fl uid on PULL side to
fl ow back to tank.
This causes piston and collet to move forward and
pushes nose assembly and tool off the swaged
(installed) fastener. Nose assembly jaw release contacts
jaws, causing them to open and release the broken-off
pintail. The
Ejector Rod
hydraulically ejects the pintail
out the front of the nose assembly. When the piston
reaches the end of its RETURN stroke, pressure is built
up causing the POWERIG idler valve (except on models
910 and 911) to go to idling pressure. Idling pressure
keeps the tool piston and nose assembly collet, jaws,
etc. in the forward position ready for the next installation
cycle.
A fl at on the front end of the relief valve was designed
to provide a passage for hydraulic fl uid from RETURN
side of piston to PULL side of piston and back to tank.
When tool hoses and cord are connected to POWERIG
WARNING: Huck recommends that a Huck
POWERIG
®
be used to power Huck tools.
Hydraulic power units that deliver high
PULL and RETURN pressures—but which
are NOT equipped with RELIEF VALVES—
are specifi cally NOT RECOMMENDED and
may be dangerous.
Set the PULL and RETURN pressures
as specifi ed in S
PECIFICATIONS
. Failure to
properly set these pressures may result in
serious personal injury.
Huck Pressure Gauge (P/N T-124883CE) is
available, and should be used as indicated
in its instruction manual.
