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PC 4500 Series
Technical Information
Hydraulics
Heavy-duty pump, motor, reservoir
and control are assembled into
one unit. A centrally located lift
cylinder, mounted vertically,
is equipped with long-life
polyurethane packings. A
pressure compensating flow
control valve is an integral part
of the valve block and regulates
lowering speed. Overload valve
protects hydraulic components.
Drive Unit
All gear drive from drive motor to
drive wheel axle. Crown-manu-
factured gears are hard finished
and dual machined for high quality.
Drive tire axle is mounted in the
drive unit on both sides for maxi-
mum strength in rough floor or
docking applications. Drive unit is
top and bottom mounted. Top
mount is a large, tapered roller
bearing for vertical or horizontal
forces. Bottom mount has four
shock mounted rollers on drive
unit running in a hardened steel
roller race. Gear train runs in oil-
filled, sealed housing.
Caster System
Standard on the PC 4500 Series
are the quick adjustment casters.
These casters adjust quickly to
enable braking, traction, steer
effort and stability to be
“balanced” based on your
specific application. This system
can also increase drive tire life by
as much as 60% by permitting
more tire wear. The optional
torsion bar suspension is avail-
able to maximize stability on tall,
unwieldy and less stable loads.
Fork Assembly
Fork width - 9.12" on standard-
tip fork models, 10" on extended-
tip fork models. Fork spread - 22"
and 27" standard on standard-tip
models. 23"- 26" spread available
in one-inch increments. 23" and
28" standard on models with
extended-tip models. Fork spreads
from 24"- 27" available in one-
inch increments. Fork lengths -
36, 42, 48, 54, 60 and 96" with
standard tip; 84, 93, and 96"
forks available with extended-tip
design for shorter wheelbase.
To facilitate pallet entry/exit
Crown has engineered several
features into their fork assembly.
Standard-tip forks have pallet
entry rollers to lift fork over bottom
board of pallet. Rollers are made
of high molecular weight polyeth-
ylene with .75" axle and roll pin.
e-GEN
™
Braking System
Variable regenerative motor
braking is optimized and virtually
eliminates brake maintenance.
While moving, e-GEN braking is
applied if the operator moves the
standard handle into the brake
zone, activates brake levers on
“T” handle, removes travel input
request or reverses direction.
The closed loop Access 123
traction control will keep the
truck static until a travel input is
requested, even when operating
on a grade.
Automatic electric parking brake
activates when the truck has
been stationary for four seconds,
the truck is keyed off or the bat-
tery has been disconnected.
.
Pallet Planning Guide
On standard-tip fork models, the
load wheel will drop in the second
opening of the pallet when “A” or
“B” dimension equals the nominal
fork length. On extended-tip fork
models, the load wheel will drop
in the first opening of the second
pallet. On models with a single
load wheel, the “C” dimension
should be 6" maximum and the
“D” dimension should be 14" mini-
mum. On models with tandem
load wheels, the “C” dimension
should be 6" maximum and the
“D” dimension should be 17"
minimum. Customers that need
tandem load wheel trucks, but
use pallets with smaller openings,
may be accommodated if the
maximum lift height of the truck is
reduced. Contact your Crown
dealer for details.
Extended-tip fork design has
totally enclosed tip, with full length
convex bottom surface creating
an entry ramp. Ramp design
helps fork glide over bottom
boards of pallet and keeps welded
edges from touching bottom
boards of pallet.
Abrasion resistant steel entry/exit
slides on both sides of each fork
have convex bottom surfaces to
prevent snagging as forks move
over bottom boards of pallet.
One-piece design with radiused
edges are welded away from
contact point of slide.
Exit roller design prevents load
wheel from dropping after cross-
ing bottom board. The 4" wide,
steel exit roller is positioned di-
rectly behind the load wheel
to keep the fork rolling. The
entry/exit slide design also assists
in trouble-free pallet entry/exit.
Fork adjustment is done at the toe
with no need to remove a cover
plate. Fork heel height adjustment
is done quickly without removing
battery. Quick and easy fork
adjustment promotes servicing of
fork assembly to keep pallet
entry/exit productive.
Pull rod design incorporates a
replaceable “tenon” design for
fast servicing of pull rod while still
in the truck.
Power Unit Structure
Heavy gage steel is used in the
power unit structure and skirt.
Rugged steel power unit doors
protects electronic components
and swing open providing
excellent access. Doors also can
be lifted off if desired. Door bolts
have exclusive convex design
that mate with concave door
holes for fast reinstallation of bolts.
Crown provides an exclusive
5 year Supplemental Guarantee
on the Power Unit and Fork
Weldment structures.
Other Options
1. Audible travel alarm
2. Flashing lights
Safety considerations and dangers
associated with audible travel
alarms and flashing lights include:
• Multiple alarms and/or lights
can cause confusion.
• Workers ignore the alarms
and/or lights after day-in and
day-out exposure.
• Operator may transfer the
responsibility for “looking out”
to the pedestrians.
• Annoys operators and
pedestrians.
Dimensions and performance
data given may vary due to manu-
facturing tolerances. Performance
is based on an average size vehicle
and is affected by weight, condi-
tion of truck, how it is equipped
and the conditions of the operating
area. Crown products and speci-
fications are subject to change
without notice.
A
A
B
DD
CC
First
Opening
Second
Opening