Milton CAT 305.5D CR User Manual

303.5D CR, 304D CR,
305D CR, 305.5D CR

Mini Hydraulic Excavators

303.5D CR 304D CR 305D CR 305.5D CR

Engine

Engine Model Mitsubishi S3Q2 Mitsubishi S3Q2-T Mitsubishi S4Q2 Mitsubishi S4Q2-T
Net Power (ISO 9249) 22 kW (30 hp) 29 kW (39 hp) 31 kW (42 hp) 35 kW (47 hp)

Weights

Operating Weight with Canopy 3540 kg (7,800 lb) 3855 kg (8,500 lb) 4995 kg (11,012 lb) 5305 kg (11,696 lb)
Operating Weight with Cab 3700 kg (8,160 lb) 4015 kg (8,852 lb) 5155 kg (11,365 lb) 5465 kg (12,048 lb)

Operating Specifications

Maximum Dig Depth 3180 mm (10'4") 3430 mm (11'3") 3670 mm (12'1") 3870 mm (12'8")

Features

Comfortable Operation

Spacious operator station provides a comfortable
working environment with easy-to-use, fingertip
controls for the boom swing and auxiliary
hydraulic functions.

Compact Radius Design

The machine’s compact design lets you work
easily in confined areas. New to the D-Series,
the 303.5DCR and the 304D CR feature a zero
tail swing (ZTS) design, keeping the radius of the
upper body within the width of the undercarriage.

Superior Performance

High digging forces and fast cycle times boost
your productivity. All four models feature a closed­center, load-sensing hydraulic system providing
smooth, powerful performance and increased
fuelefficiency.

Work Tools

Increase the versatility of your machine with
Cat®Work Tools.

Durable Undercarriage

Rubber track undercarriage allows you to work
on multiple surfaces without damaging either
the surface or the machine. Steel tracks and
steel tracks with rubber pads are also available
depending on your application.

Contents

Operator Station ..................................................3

Performance ........................................................4

Compact Radius, Zero Tail Swing .....................5

Coupler and Work Tool Options ........................6

Dozer Blade..........................................................7

Undercarriage .....................................................7

Serviceability .......................................................8

Customer Support ...............................................8

Specifications ......................................................9

Standard Equipment .........................................15

Optional Equipment...........................................15

The Cat® D-Series Mini Hydraulic Excavators deliver
high performance in a compact size to help you work in
the tightest applications. All four models feature a large,
integrated counterweight and improved stability while
maintaining a compact radius design. Spacious operator
station and ergonomic, easy-to-use controls keep you
comfortable throughout the work day. Powerful digging
forces, fast cycle times and increased stability lead to
more production, helping you get more done and improve
your bottom line.

2

Operator Station

Superior comfort to keep you productive throughout the work day.

Comfortable Working Environment

Spacious and comfortable operator station with excellent
visibility and legroom keeps the operator comfortable and
reduces fatigue. Standard features include:

• Reclining suspension seat with adjustable wrist rests.

• Pilot operated controls on all services including travel
levers and dozer functions.

• Two post canopy design for better visibility to the
workarea.

• A pattern control changer (not available in all regions)
isaccessible from the cab to switch between excavator
and backhoe style controls.

• Ample storage space under the seat that can be locked
for added security.

Optional Enclosed Cab

For even greater operator comfort, an enclosed cab
isavailable as an option and features:

• Sealed cab with heat and optional air conditioning
tokeep you comfortable in a wide range of conditions.

• Radio ready with speakers and easy radio installation.

• Removable lower front window and sliding windows
forexcellent overall visibility.

• Gas assisted front window slides up with minimal effort.

• Sliding door system offers good access and maintains
the machine’s compact dimensions, reducing the risk
ofdamage.

Joystick Controls

The boom swing and auxiliary hydraulic functions are
located at your ngertips providing smooth, easy operation.
These joystick mounted controls deliver more productivity
through precise movement of the boom swing and auxiliary
functions. They also eliminate foot pedals and free up the
oor for more room for the operator’s feet.

100% pilot controls provide consistent ow and pressure
throughout the life of the machine. This also allows
allcontrols to be locked out while starting the machine
andwhen the safety lockout bar is in the up position.

3

Performance

Powerful digging with precise control.

Stability

All four D-Series models feature increased stability over
the previous series, while maintaining the compact radius
design. This increased stability leads to more productivity
and versatility through the use of heavier work tools and
theoptional long stick.

Fast, Powerful Digging with Load Sensing Hydraulics

High digging forces and fast cycle times deliver the productivity
that your job demands. Load sensing hydraulics optimize
ow for smooth, powerful performance and increased
fuelefciency.

Engine

High performance power train provides optimized engine
horsepower and strong performance. Engine meets U.S. EPA
Tier 4 Interim and EU Stage IIIA emissions requirements.
Automatic engine idle automatically lowers engine revolutions
when not in use to conserve fuel and lower environmental
noise and emissions. The D-Series models feature an engine
kill switch conveniently located in the cab and accessible
from ground level.

Automatic Two Speed

With the standard automatic two speed feature, the machine
will automatically balance high speed and torque travel
requirements based on the conditions to give the operator
the optimum speed and control. The machine can be put in
low gear if slower travel is desired while in tight conditions.

200 Degree Bucket Rotation

Industry leading bucket rotation of over 200 degrees
provides greater material retention during truck loading.
Italso allows for easier vertical wall digging without having
to reposition the machine.

4

Compact Radius, Zero Tail Swing

Work in the tightest areas.

Compact Radius

The compact radius design gives greater machine versatility and the capability to work within conned
areas. This allows the operator to concentrate on the work being done without having to worry about
damaging the back of the machine or other job site obstacles. On the 305D CR and the 305.5D CR,
theupper body stays within 140 mm (5.5 in) of the undercarriage.

Zero Tail Swing

New to the D-Series, the 303.5D CR and the 304D CR models feature a zero tail swing design. On these
models, the radius of the upper body stays entirely within the width of the undercarriage.

5