Cylinder Piston:High temperature cup seals and heavy-duty

wear rings protect the cylinder barrel from

damage (scoring).

Switching Valve and Control Valve Actuator:Made of chromated corrosion resistant

aluminum alloy for a longer life.

• Trouble free poppet valve design.

• Determines load or unload mode

• Electric option available

Manifolds: Manifolds are identical and

interchangeable with only minor

hydraulic fitting changes.

Check Valve: JIC fittings. Externally mounted valves are

easily accessible and interchangeable.

Cylinder Barrel:The cylinder design increases the system’s

strength by using all the cylinders as structural

members. The cylinder barrel and not the rod,

moves the cross drive and floor. The large

barrel size and the shorter cylinder length

reduce deflection from the unloading forces.

Cylinder Head:The design includes two wear rings to protect

the seal and buffer seal from damage. Industrial

wipers clean the rods and reduce entry of

contaminants. Chromated cylinder head

reduces potential for corrosion.

Cylinder Rod: The cylinder rod is a structural member

of the drive unit and is attached at both

ends of the drive frame. The short rod

length and the drive frame attachment

reduce deflection from unloading forces.

The rod is induction case hardened

chrome plated for excellent wear.

Cross-Drives:Each cross-drive is supported by two

full length UHMW bearings mounted

on the trailer’s main frame beams.

M

B. Electric with Filter

A. Electric

M

M

page 2F-SeriesKFD 425 - Superior by Designpage 1

Ball Valve: Standard manual on/off

can be easily upgraded

to optional electric valve

for remote control

(wireless or by cable).

Pressure Filter: Large pressure filter for

longer service life.

NOTE: Options A- B can be used

with this On/O� Valve Body

• Fully supported by trailer main frame beams

• Low friction bearing support surface

• Strengthens drive unit area and reduces deflection

• Reduces the load on cylinders

• Standard design feature on all KEITH systems

Cross-Drive Support

SUPERIOR BY DESIGN

Design Features

KFD-425 WarrantyTwo year limited hydraulic warranty; please check with your owner’s manual, your sales representative or the KEITH website under warranty for KFD systems for more information.

Hydraulic Specifications:

KEITH® Service Clinics:Start Up Clinics, Service Clinics, Trouble Shooting Clinics and Training

Clinics are available to all KEITH customers and dealers. Please contact

your KEITH sales representative for more information.

Hydraulic Drive Unit Specifications KFD-425 Cylinder Bore Size 108 mm /4.25” Cylinder Stroke 200 mm /8” Maximum Working Pressure 210 Bar/ 3045 PSI Maximum Pump Flow 110 liter/ 30 gallon Load Capacity Exceeds Legal Limit Speed @ Maximum Pump Flow

2.5 m/minute8.2 ft/minute

• Interchangeable components reduce parts inventory

• Drive shoe designed for pre-drilling of floor planks

• Hydraulic components easily accessible for maintenance

• Chromate finish protects components from corrosion

• Durable & reliable light weight construction

Nut Bar:Inline pattern allows floor planks

to be installed completely from

the top for fast one person

installation.

Three Point Floor Plank Support System:1. Large bearing surface

2. Heavy–duty legs and 25mm x 25mm

tube or channel (1”x1” ) support load

3. Bearing “wings” provide a solid foundation

Cross-Drive Shoes:Long cross-drive shoes provide

structural strength to the floor

planks. Inline bolt pattern on drive

shoes allows for the pre-drilling of

aluminum floor planks.

Floor Planks:All floor planks are

interchangeable and can be

pre-drilled and

pre-countersunk for quick

one person installation.

Bearing

Floor Plank Profiles

Floor planks are available in a large

selection of profiles designed for light to

medium to severe duty for bulk materials

and pallet cargo. These include the PS™,

STANDARD DUTY, IMPACT™ and

V-FLOOR® Series. The V-FLOOR® planks

feature planks without seals, with the

bearing becoming the seal.

Winged Bearing*136 mm

(5.375”) Length

V-FLOOR®

J-Bearing

Length of Subdeck

End Cap

Splash Guard

Hold-Down*1.82 m (6’) Length

Hold-Down

Bearing

146 mm

(5.75”) Length

Smaller Drive Window:Compact drive unit allows for the

smallest opening in the trailer frame,

resulting in a stronger trailer design.

•The bearings shown in the bearings section marked * can be used on 25mm x 25mm

(1”x1” ) channel.

Splash Guard Hold-Down Bearing:• Full length floor plank hold-down

with full length floor support

• More than two times the bearing

surface compared to other systems

• Protects floor planks from road

debris

• Increases bearing and floor

plank life

• Fast and easy installation

25mm x 25mm (1” x 1”) Channel: • Lighter without compromising strength

• Bolted or welded to cross members. Splash bearings run full length

• Faster bearing installation

Optional: 25mm x 25mm (1”x1”) Tubing

PRESSURE SEAL®

Length of Subdeck

page 3 F-SeriesKFD 425 - Superior by Designpage 4

1

2

3

SUPERIOR BY DESIGN

Divided Forces Non-Divided Forces

Frame Design - Divided Unloading Forces• 50% of forces on each end of drive frame

• Results in less frame stress

• Longer frame life

• Equal forces in both directions for loading and unloading

Cylinder Design – De�ection • Cylinder is a structural component of the drive frame

• Piston rods do not move and are attached to both ends

of the drive frame

• The shorter length cylinder reduces deflection from

unloading forces

• The cylinder barrel acts to reduce deflection from

unloading forces

• Three point (1,2,3) support between cylinder heads and

piston reduces deflection

DRIVE SHOES

Floor Support

CYLINDER & PISTON

Deflection

SUPERIOR BY DESIGN

Drive Comparison

OTHER SYSTEMS:

KFD /F-SERIES:

OTHER SYSTEMS:

KFD /F-SERIES:

Other SystemsKFD /F-Series

Other SystemsKFD /F-Series

1220

mm

(48”

)

1905

mm

(75”

)

Hydraulic Drive Design – Compact/Interchangeability• Compact design for strength

• Universal drive unit - one design fits all trailers

• Lightweight

• Small drive unit opening for increased trailer strength

• Low overall drive unit height

• Modular design for easy maintenance and repair

• Interchangeable components means reduced parts inventory

• Inline bolt pattern on long shoes allows for pre-drilling of floor planks

page 6F-SeriesKFD 425 - Superior by Designpage 5

571 mm (22.5”) A

B

203 mm (8”)

Shoe

Shoe

50% of unloading force

100% of unloading force

50% of unloading force

Long Drive Shoe Design – Structural Strength• Excellent floor plank support

• Adds structural strength

• Better distribution of unloading forces to floor planks

• Supports load in drive area

• A<B = greater floor support

• Standard design feature on all KFD drive units

Note: Drive units shown to scale

31 2

Floor Plank

Floor Plank