Keith LeakProof III User manual

LeakProof III
KEITH Manufacturing Co.
www.KeithWalkingFloor.com
World Headquarters
Toll-Free: 800-547-6161
Phone: [phone]
OWNER / OPERATOR MANUAL
Released: 2023-04-17 DOC06436 Rev B
©2023 KEITH Manufacturing Co. All Rights Reserved. KEITH, KEITH logo and WALKING FLOOR are registered trademarks of KEITH
Manufacturing Co. Equipment manufactured by KEITH Manufacturing Co. is protected by numerous patents both domestic and foreign.
Original Instructions

OWNER / OPERATOR MANUAL LeakProof III
i DOC06436 Rev B
Table of Contents
Introduction ii
KEITH®Standard Drive WALKING FLOOR®Unloading System Limited Warranty iii
Warranty Registration Card v
1.0 Safety 1
2.0 Specications 2
2.1 General Wet Kit Specications 2
2.2 Floor to Wet Kit Diagram 3
2.3 Floor Speed vs Pump Flow Rate 4
3.0 Operation 5
3.1 Oil Flow Diagram 5
3.2 Start-Up 6
3.3 Standard Operating Procedures 6
4.0 Maintenance 8
4.1 Life Extending Practices 8
4.2 Bolt Torque Requirements 8
5.0 Troubleshooting 9
5.1 Switching Valve 9
5.2 Check Valve 9
5.3 Check Valve Replacement 11
5.4 Technical Support 12
6.0 Contact Information - KEITH Manufacturing Co. 12

OWNER / OPERATOR MANUAL LeakProof III
ii DOC06436 Rev B
Introduction
We at KEITH Manufacturing Co. are very happy you have decided to equip your trailer with the KEITH®
WALKING FLOOR®system. We take great pride in manufacturing the simplest, lowest maintenance self-
unloading system available. Installing the KEITH®WALKING FLOOR®system in your trailer provides you
with the versatility to load or unload virtually any type of material.
The following pages contain information on the operation of your KEITH®WALKING FLOOR®system.
Further support and safety documents (manuals, brochures, and product specs) can be viewed or
downloaded from our website at www.KeithWalkingFloor.com.
In addition, we have provided general information on the type of hydraulic wet kit that will be needed to
operate your system. Please contact a KEITH sales representative or visit our website for more specic
recommendations regarding pumps, lters, pressure relief valves and approved equivalent equipment.
It is critical to adhere to the outlined hydraulic wet kit specications. Failure to follow the guidelines
concerning required operation pressures can lead to system failure due to excessive heat buildup.
Please review the entire manual before operating the KEITH®WALKING FLOOR®system. If you have
any questions, please call 541-475-3802 or email [e-mail] where our support team
will happily assist you.
Thank you again for putting your trust in our company!
Sincerely,
R. Mark Foster
President
DOC06344 Rev A

OWNER / OPERATOR MANUAL LeakProof III
iii DOC06436 Rev B
KEITH®Standard Drive WALKING FLOOR®Unloading System Limited Warranty
1 Year Limited Warranty
KEITH Manufacturing Co. hereby warrants, to the rst owner of a new KEITH®Standard Drive Unloading
System from the factory or selling distributor, that the product shall be free from defects in material and
workmanship for a period of one year after delivery or sale to the rst registered owner. This warranty does
not cover normal wear and tear and maintenance. A warranty card must be lled out and returned to KEITH
Manufacturing Co. to activate this warranty.
Unloading system must only be used as recommended by KEITH Manufacturing Co. for normal use and
service. This means the loading and/or unloading of uniformly distributed, non-corrosive material, properly
restrained and secured, on properly maintained public roads, with gross vehicle weights not in excess of factory
rated capacity. For stationary installations, normal use and service means the conveying of uniformly distributed,
noncorrosive materials, with weights not in excess of factory rated capacity. The system must be installed
according to KEITH Manufacturing Co. installation instructions. Preventative maintenance must be performed
at regular intervals as specied in KEITH Manufacturing Co. manuals. See below for circumstances that
void the KEITH limited warranty.
Sole and Exclusive Remedy: If the product covered hereby fails to conform to the above stated warranty,
KEITH Manufacturing Co.’s sole liability under this warranty and the owner’s sole and exclusive remedy is
limited to repair or replacement of the defective part(s) at a facility authorized by KEITH Manufacturing Co.
THE WARRANTY SET FORTH ABOVE IS EXPRESSLY MADE IN LIEU OFANY OTHER WARRANTIES,
EXPRESS, IMPLIED, OR STATUTORY. KEITH MANUFACTURING CO. MAKES NO WARRANTIES OF
FITNESS FOR A PARTICULAR PURPOSE OR WARRANTIES OF MERCHANTABILITY. FURTHER,
KEITH MANUFACTURING CO. WILL NOT BE LIABLE FOR INCIDENTAL OR CONSEQUENTIAL
DAMAGES SUCH AS, BUT NOT LIMITED TO, THE LOSS OF USE OF THE PRODUCT, DAMAGE TO
THE PRODUCT, ATTORNEY’S FEES AND THE LIABILITY IN RESPECT TO ANY OTHER REASON.
TORT DISCLAIMER: KEITH MANUFACTURING CO. EXCLUDES ANY LIABILITY IN TORT WITH
RESPECT TO THEIR PRODUCTS, INCLUDING ANY LIABILITY BASED ON STRICT LIABILITY IN
TORT AND NEGLIGENCE.
If This Warranty Violates Law: To the extent any provision of this warranty, contravenes the law of any
jurisdiction, that provision shall be inapplicable in such jurisdiction and the remainder of the warranty shall not
be a󰀨ected thereby.
Warranty Return Policy
Any defective part(s) must be shipped freight prepaid to the nearest KEITH facility. Please contact KEITH
for additional information on proper locations. Before returning any item for repair or replacement, contact
KEITH Manufacturing Co. at 1-800-547-6161 or [e-mail] for a “Returned Goods
Authorization” (RGA) number. Make sure the RGA number is on the outside of the shipping carton and all
paperwork is included.
The following information is needed:
a. Company name e. Part number
b. Contact name f. Quantity
c. Address g. Reason for return
d. Phone number h. Customer’s account number

OWNER / OPERATOR MANUAL LeakProof III
iv DOC06436 Rev B
The following circumstances void the KEITH Limited Warranty:
• Unloading system is not installed properly.
• Wet kit is not as recommended by KEITH or using an end dump or dump truck wet kit.
• Malfunction or problems caused by equipment which was not supplied by KEITH.
• Malfunction caused by improper repair work or repair work which is carried out by third parties.
• Malfunction caused using contaminated oil or oil of the wrong type.
• Malfunction caused by excessive heat over 140 °F [60 °C] due to a bad hydraulic pump on the truck
or hydraulic wet kit or improper operation of the unloading system, for example, not fully opening and
closing the ball valve.
• Defects in electrical components caused by incorrect connection and/or incorrect voltage levels.
• Preventative maintenance is not performed at regular intervals as specied in KEITH manuals.
• Malfunction caused by corrosive materials.
• Malfunction caused by overloading or improper use as stated in KEITH manuals.
Examples of wear items which are not covered by KEITH Limited Warranty:
• Floor seals
• Floor bearings
• Floor slats
• End plugs in slats
• Filter elements and components
Revised March 2022 DOC06367 Rev. B

OWNER / OPERATOR MANUAL LeakProof III
v DOC06436 Rev B
Warranty Registration Card
Note: To validate the warranty, the registration information must be lled out completely and returned to KEITH
within ten (10) days of purchase and/or installation.
Please ll out the Warranty Registration form on our website at www.KeithWalkingFloor.com or ll out the
Warranty Registration Card below and mail or email it to:
KEITH Manufacturing Co.
P.O. Box 1
Madras, OR 97741-0001
[e-mail]
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
This warranty registration card must be completed and on le at KEITH in order for the warranty period to
begin on the purchase date. If no purchase date is registered, the beginning of the warranty will automatically
revert to the manufacture date.
Name / Company Name: _______________________________________________________________
Address: ____________________________________________________________________________
City, State / Prov.: ___________________________________________ Postal Code: ______________
Country:____________________________________________________________________________
Phone: _____________________________________________________________________________
E-Mail: _____________________________________________________________________________
SYSTEM DATA:
Date of Purchase: ____________________________________________________________________
Model / Serial Number: ________________________________________________________________
Purchased From: ____________________________________________________________________
Type of Material Loaded/Unloaded: ______________________________________________________
I have fully read the KEITH Manufacturing Co. warranty information and fully understand and agree to the
terms of the warranty.
Name: ___________________________ Date: __________ Signature: __________________________

OWNER / OPERATOR MANUAL LeakProof III
1 DOC06436 Rev B
1.0 Safety
WARNING: The large forces exerted by the oor when moving can result in damage to
equipment which may result in serious injury or death. Always ensure that this manual has been
read and fully understood by the operator. We advise that the operator keeps this manual with
the vehicle at all times. Always ensure that ‘best practice’ is employed when using our systems.
If in any doubt do NOT use this equipment and seek further assistance from your company’s
safety o󰀩cer.
!!CAUTION!!
To Prevent Possible Injury or Death
1. DO NOT Operate the oor with the doors closed.
2. DO NOT Stand behind the trailer or in the discharge area.
3. DO NOT Make adjustments to the unloading mechanism with the oor operating.
4. DO NOT Operate the unloader when protective covers and screens are not in place.
5. DO NOT Go underneath the trailer.
6. DO NOT Leave the trailer unattended while the unloader is in operation.
ALWAYS:
1. Disconnect the trailer from the hydraulic power unit (P.T.O.) before service and maintenance.
2. Shut o󰀨 the power supply before going underneath the trailer.
3. Stay away from any oil leaks when hydraulic pressure is high.
4. Shut o󰀨 the hydraulic power take o󰀨 unit (P.T.O.) before moving the trailer.
!!Keep your hands, body parts and loose clothing away from the oor slats
and drive mechanism when the unloading system is in operation!!

OWNER / OPERATOR MANUAL LeakProof III
2 DOC06436 Rev B
2.0 Specications
2.1 General Wet Kit Specications
Transmission:
This wet kit is designed for a Fuller 13 or 15 speed transmission. All of the following
information applies to this transmission. (P.T.O. specications may vary with other
transmissions. Please check with KEITH® Manufacturing Co. for specications)
Oil: Chevron AW46 hydraulic oil or equivalent.
P.T.O.: Chelsea series 442/489 bottom mount (6 or 8 bolt) 118% Power Take O󰀨 (electric
over speed is highly recommended), or Muncie P.C. 65 with electric over speed.
Pump: Commercial P-51 A297BE (Spl.) 25-25 (2” four bolt suction) with Anchor
W43-32-32 ange.
Filter:
Filter should be 10 micron on the return line.
Filter should be a double element Zinga (or equivalent.) Filter head #DF-15-25.
MF 2215-25-0-2-0
Filter element #LE-10 or LE-30.
(The lter element should be changed after 6 hours initially, and then every 6
months thereafter. This may vary with the operating environment.)
Hydraulic
Reservoir:
Should hold approximately 1 gallon of oil for every liter per minute you plan to
pump, i.e. 40 GPM = 40 gallon reservoir. Reservoir should hold a minimum of 40
gallons of oil.
Suction Line:
Suction line from the tank to the steel tubing should be no more than 1 meter in
length and a minimum of 2” inside diameter.
Example: SAE-100R4. (This type of line has a spiral wire to keep the hose from
collapsing under suction.)
Pressure Line: Hose from truck to trailer should be 3/4” 16 SAE-100R2.
Return Line: Hose from trailer to lter should be 3/4” 16 SAE-100R1.
Hose from lter to tank should be 1-1/4” 20 SAE-100R1.
*Pressure Relief
Valve: Example: Cross #RD12D
*Note: It is critical that this relief valve is set at no less than 2800 PSI and no more than 3000 PSI.

OWNER / OPERATOR MANUAL LeakProof III
3 DOC06436 Rev B
2.2 Floor to Wet Kit Diagram
NOTE: Refer to Parts Catalog for additional information on ttings.
To have proper operation of your KEITH®WALKING FLOOR Unloader, the following check list and diagram
must be followed. This is critical or your warranty may be voided.
TRACTOR: 1) Male quick coupler to be on the return line
(Line through lter to tank).
2) Female quick coupler to be on pressure line
(Line from pump).
TRAILER: 1) Female quick coupler to be on return line
(Line from switching valve port stamped “RES”)
2) Male quick coupler to be on pressure line
(Line to switching valve port stamped “PUMP”).
If you have any questions of problems, call KEITH Manufacturing Co. [phone] or [phone]
Return Line Reservoir
Relief Valve
Trailer Return Line
Female Quick Coupler
Tractor Return Line
Male Quick Coupler
Filter Heads
Lines to and
from Drive Unit
Trailer Pressure Line
Male Quick Coupler Tractor Pressure Line
Female Quick Coupler
Pressure Line
NOTE: PRESSURE LINE
MUST BE ATTACHED TO
THIS PORT!!!
Switching Valve
3/4” Pressure
Relief Hose
2” Suction Hose
Pump
P.T.O.

OWNER / OPERATOR MANUAL LeakProof III
4 DOC06436 Rev B
2.3 Floor Speed vs Pump Flow Rate
With a Fuller 13 or 15 speed transmission, a bottom mount 118% series 442/489 Chelsea power take o󰀨,
and a Commercial p-51 pump with a 2 1/2” gear, the tractor unload RPM in relation to oor movement is
as follows*.
Truck RPM Pump Output Floor Movement
950 RPM 30 gallon 7.3 ft/minute
1270 RPM 40 gallon 9.8 ft/minute
1430 RPM 45 gallon 11.1 ft/minute
1750 RPM 55 gallon 13.3 ft/minute
1900 RPM 60 gallon 14.6 ft/minute
Above specications are for KEITH®LEAKPROOF III Drive units with 80mm bore cylinders. These are
approximate feet per minute only and should be used strictly as a guide.

OWNER / OPERATOR MANUAL LeakProof III
5 DOC06436 Rev B
3.0 Operation
3.1 Oil Flow Diagram
Oil Flow Diagram (Phase #1 through #4) Unloading LEAKPROOF III DRIVE
Pressure Return Blocked Return Oil Standing Oil
Check Valve
Return
Pressure
Switching
Valve
Check Valve
Return
Pressure
Check Valve
Return
Pressure
Switching
Valve
Check Valve
Return
Pressure
Pressure in the rear of all cylinders as shown in .
Open to return.
Blocked by check valves.
Note: Phase 1 requires more pressure than phase 4.
The #1 cylinder completes its full stroke, opening
the check valve and allowing the oil in the #2 cylinder
to escape as shown in . ( Shows standing oil.)
Pressure still in rear of all cylinders as shown in .
Blocked by check valve.
Note: Phase 2 requires more pressure than
phase 1.
Phase 3
The #2 cylinder completes its full stroke, opening the check
valve and allowing the oil in the #3 cylinder to escape to
return as shown in . ( Shows standing oil.)
Pressure still in rear of all cylinders as shown in .
Note: Phase 3 requires more pressure than phase 2.
Phase 4
Phase 1 Phase 2
When the #3 cylinder completes its stroke, the
pressure and return are switched by the switching
valve, transferring the pressure to the front of all
cylinders as shown in . All cylinders are open
to return as shown in . All cylinders move to
rear of trailer together, moving the load.
Note: Phase 4 requires less pressure than
phases 1, 2, or 3.
Switching
Valve
Switching
Valve
Control
Valve
Control
Valve
Control
Valve
Control
Valve
KEITH® RUNNING FLOOR II™ - OIL FLOW DIAGRAM, revised May, 2001

OWNER / OPERATOR MANUAL LeakProof III
6 DOC06436 Rev B
3.2 Start-Up
Before starting your new KEITH®LEAKPROOF III unloader, a quick start-up check should be made.
9Is your entire system plumbed to the plumbing diagram?
9*Pump: Will it pump 30-35 GPM at pressure?
9*Relief Valve: Is it set between 2800 to 3000 PSI?
9Oil: Have you lled the reservoir?
9P.T.O.: Is it engaged?
9Quick Disconnects: Are they completely engaged?
9Ball Valve: Is the ball valve on the drive unit closed?
9Is the pressure line on the trailer attached to the pressure line on the tractor and the return line
attached to the return line?
The pressure and return lines must attach to their proper ports on the switching valve.
*Note: If the information about your pump and relief valve is not available, a pressure/ow
check will help determine this information. Be sure that your entire wet kit system meets the
requirements of the hydraulic wet kit specications in this booklet.
3.3 Standard Operating Procedures
UNLOADING
1. To unload with your KEITH LEAKPROOF III Drive, engage the P.T.O. then bring the tractor engine
up to the predetermined unloading RPM.
2. Pull the control valve handle all the way out. (See Diagram A.)
3. Make sure that the ball valve, located between the pressure and return lines, is in the closed
position. (See Diagram B.) This ball valve is used for the emergency shut-o󰀨. Your trailer oor should
now be operating.
4. To stop the oor at any time during the loading or unloading process, switch the ball valve to the
open position. (See Diagram B.)
LOADING
1. To manually load with your bidirectional KEITH LEAKPROOF III Drive, simply turn the control
valve handle parallel to the ground and push it under the valve body. (See Diagram A.) Then follow
instructions 1,3 and 4 listed above.

OWNER / OPERATOR MANUAL LeakProof III
7 DOC06436 Rev B
!!NOTE!! Make sure trailer doors are open BEFORE starting the oor or serious damage may occur.
Operation of Your LEAKPROOF III Drive LEAKPROOF III DRIVE
OPERATION OF YOUR KEITH®LEAKPROOFIII DRIVE
UNLOADING
1.To unload with your KEITH LEAKPROOF III Drive, engage the P.T.O. then bring the tractor
engine up to the predetermined unloading RPM.
2.Pull the control valve handle all the way out. (See Diagram A.)
3.Make sure that the ball valve, located between the pressure and return lines, is in the closed
position. (See Diagram B.) This ball valve is used for the emergency shut-off. Your trailer
oor should now be operating.
 4.To stop the oor at any time during the loading or unloading process, switch the ball valve to
the open position. (See Diagram B.)
LOADING
1.To manually load with your bi-directional KEITH LEAKPROOF III Drive, simply turn
the control valve handle parallel to the ground and push it under the valve body.
(See Diagram A.) Then follow instructions 1,3 and 4 listed above.
!!NOTE!!
Make sure the trailer door is open BEFORE
starting the oor or the trailer door will be damaged.
Diagram A: Control Valve
(Manual Version)
Diagram B: Ball Valve
(View in Closed Position. Push handle
to the curb side to open.)
[View is from beneath the trailer.]
Diagram A: Control Valve
(Manual Version)
Diagram B: Ball Valve
(View in Closed Position. Push
handle to the curb side to open.)
[View is from beneath the trailer.]
Speed of Floor in Relation to Engine RPM LEAKPROOF III DRIVE
SPEED OF FLOOR IN RELATION TO ENGINE RPM
With a Fuller 13 or 15 speed transmission, a bottom mount 118% series 442/489 Chelsea power take
off, and a Commercial p-51 pump with a 2 1/2” gear, the tractor unload RPM in relation to oor move-
ment is as follows*.
TRUCK RPM
950 RPM
1270 RPM
1430 RPM
1750 RPM
1900 RPM
PUMP OUTPUT
30 gallon
40 gallon
45 gallon
55 gallon
60 gallon
FLOOR MOVEMENT
7.3 ft/minute
9.8 ft/minute
11.1 ft/minute
13.3 ft/minute
14.6 ft/minute
*Above specications are for KEITH® LEAKPROOF III Drive units with 80mm bore cylinders. These
are approximate feet per minute only and should be used strictly as a guide.
1” Female Quick Coupler
2404-16-16
Straight
10643-16 Crimp
Hose Fitting
1” Pressure Hose
2603-16-16-16
Tee
10643-12 Crimp
Hose Fitting
2404-12-12
Straight
2406-12-16
Straight
10643-16 Crimp
Hose Fitting
1” Pressure Hose
6400-16-16
Straight
P.T.O.
Pump
W43-32-32 Flange
Elbow Street 2”
3/4” Pressure
Relief Hose
King Nipple 2”
2” Suction
Hose
5406-12 Socket Pipe Plug
Relief Valve
1” Rubber Shock Mount
Slight Gauge
Filler Screen Assy.
Bafe
Truck Frame
2404-20-20
Straight
2404-20-24
Straight
10643-20 Crimp
Hose Fitting
1 1/4” Filter to Tank
Return Hose
Filter Heads
10643-16 Crimp
Hose Fitting
2404-16-16
Straight
1’ Male Quick Coupler
1” Trailer to Filter
Return to Hose
Filter Elements
10643-12 Crimp
Hose Fitting
2404-12-12
Straight

OWNER / OPERATOR MANUAL LeakProof III
8 DOC06436 Rev B
4.0 Maintenance
4.1 Life Extending Practices
• For proper operation of your new LEAKPROOF III equipped trailer and wet kit, make sure the
pressure and return lines are hooked up in the correct sequence.
• Change the hydraulic return lter element after the rst (6) hours of operation and then every six (6)
months. This may vary with the operating environment.
• During the rst two (2) weeks of operation, it will be necessary to check and tighten all oor
bolts. Floor bolts should be checked regularly for proper torque, in accordance with a preventive
maintenance program, as loose oor bolts will cause serious damage to oor slats.
• After the rst week of operation, you must check and tighten the lower cross-drive clamps that fasten
the cross-drives to the cylinder. Also check the end cylinder rod plates that fasten the cylinders to the
drive frame.
• During the rst several weeks of operation, examine the check valve and tube clamps to ensure that
they are securely fastened.
4.2 Bolt Torque Requirements
Bolt Description Size Torque Values
Floor Bolts 1/2”-13 UNC Hex Cap Bolt 75 ft-lbs [101 Nm]
Clevis Clamp Bolt 3/8”-16 UNC Hex Cap Bolt 30 ft-lbs [40 Nm]
Barrel Clamp Bolts 3/4”-10 UNC Hex Cap Bolt 135 ft-lbs [183 Nm]
Rod end plates 5/8”-11 UNC Hex Cap Bolt 35 ft-lbs [183 Nm]
Check valve and tube clamp bolts 5/16”-18 UNC Hex Cap Bolt 20 ft-lbs [27 Nm]

OWNER / OPERATOR MANUAL LeakProof III
9 DOC06436 Rev B
5.0 Troubleshooting
5.1 Switching Valve
Unloading
Problem: Floor does not run at all.
Check: All items on START-UP check list. (See Start-Up check list, above.)
Problem: Cycle starts then oor stops.
Specic trouble: Driver’s side cylinder (#1) extends toward the front of the trailer, center cylinder (#2)
extends toward the front of the trailer, passenger side cylinder extends toward the front of the trailer;
then the system stops.
Solution: The (#6) check valve has malfunctioned. Replace the check valve.
Specic trouble: All three cylinders retract toward the rear of the trailer; then the system stops.
Solution: The (#1) check valve has malfunctioned. Replace the check valve.
Note: If oor stops in the full rear position and the switching valve has switched, you may not have
enough oil pressure. Less pressure is required to move the load than to pull the slats 1/3 at a time under
the load.
5.2 Check Valve
Unloading
Problem: Does not cycle correctly.
1. Specic trouble: Cylinders (#1) and (#2) extend together toward the front of the trailer while
unloading.
Solution: The check valve at the forward end of the cylinder (#1) has malfunctioned. Replace the check
valve.
2. Specic trouble: Cylinders (#2) and (#3) extend together toward the front of the trailer while
unloading.
Solution: The check valve at the forward end of the cylinder (#2) has malfunctioned. Replace the check
valve.
3. Specic trouble: All cylinders extend together toward the front while unloading.
Solution: The control valve is bypassing or the check valves at the front of the (#1) & (#2) cylinders have
malfunctioned. First replace the control valve. Then if the problem persists, replace the check valves.

OWNER / OPERATOR MANUAL LeakProof III
10 DOC06436 Rev B
Loading
Problem: Does not cycle correctly.
Specic trouble: Cylinders (#2) and (#3) extend together toward the rear of the trailer while loading.
Solution: The check valve at the rear end of the cylinder (#3) has malfunctioned. Replace the check
valve.
Specic trouble: Cylinders (#1) and (#2) extend together toward the rear of the trailer while loading.
Solution: The check valve at the rear end of the cylinder (#2) has malfunctioned. Replace the check
valve.
Specic trouble: All cylinders extend together toward the rear while loading.
Solution: The control valve is bypassing or the check valves at the rear end of the (#2) & (#3) cylinders
have malfunctioned. First replace the control valve. Then if the problem persists, replace the
check valves.
Note: When empty, some trailers will cycle in sequence forward 1-2-3, then back 3-2-1, (instead of all
slats moving together.) This is not a malfunction; no repairs are needed. When a load is put on a trailer,
the drag will cause the oor to sequence properly.

OWNER / OPERATOR MANUAL LeakProof III
11 DOC06436 Rev B
5.3 Check Valve Replacement
Replacing a KEITH®LEAKPROOF III Drive check valve is a simple procedure. The tools required to do
this are:
(1) 1/2” socket
(1) 6” or 12” extension
(1) ratchet
DISASSEMBLY
Before removing any bolts, run the cylinder away from the check valve in order to free it. Next remove
the four 5/16” x 5-1/2” bolts and the tube clamp. Loosen the other end of the tubes and remove the
check valve.
ASSEMBLY
First, make sure all of the surfaces are clean and the O-Rings are in their proper places. Put the new
check valve in place making sure it seats at on the rod end. Put the tube clamp back on the 5/16” x
5-1/2” bolts back in. Make sure the tubes t snugly back into the tube clamp and tighten the 5/16” x
5-1/2” bolts down. Tighten the other ends of the cylinder cross-over tubes and run the oor to check for
leaks.
*See check valve assembly parts list in the Parts Catalog to identify parts by given numbers.
Replacing a Check Valve LEAKPROOF III DRIVE
REPLACING A CHECK VALVE
Replacing a KEITH® LEAKPROOF III Drive check valve is a simple procedure. The tools required to
do this are:
-(1) 1/2” socket
-(1) 6” or 12” extension
-(1) ratchet
DISASSEMBLY
Before removing any bolts, run the cylinder away from the check valve in order to free it. Next remove
the four 5/16” x 5-1/2” bolts and the tube clamp. Loosen the other end of the tubes and remove the
check valve.
ASSEMBLY
First, make sure all of the surfaces are clean and the O-Rings are in their proper places. Put the new
check valve in place making sure it seats at on the rod end. Put the tube clamp back on the 5/16” x
5-1/2” bolts back in. Make sure the tubes t snugly back into the tube clamp and tighten the 5/16” x
5-1/2” bolts down. Tighten the other ends of the cylinder cross-over tubes and run the oor to check
for leaks.
*SEE CHECK VALVE ASSEMBLY PARTS LIST AND DIAGRAM
TO IDENTIFY PARTS BY GIVEN NUMBERS.
Cylinder Rod
Cross-Over Tubes
Assembled Check Valve,
Tubes and Clamps
Assembled Check Valve

OWNER / OPERATOR MANUAL LeakProof III
12 DOC06436 Rev B
5.4 Technical Support
Please have the following information readily available before contacting KEITH for support:
• Model Number (Located on the Serial Plate of the drive unit) (See 3.3 Component Location
Diagram)
• Serial Number (Located on the Serial Plate on the drive unit) (See 3.3 Component Location
Diagram)
• Quantity & length of oor slats
• Vehicle make and unit installer
KEITH Technical Support Contact Information:
Website: www.KeithWalkingFloor.com
Email: [e-mail]
Toll-Free: 800-547-6161
Phone: [phone]
6.0 Contact Information - KEITH Manufacturing Co.
World Headquarters - USA
401 NW Adler St.
P.O. Box 1
Madras, OR 97741
Toll-Free: 800-547-6161
Phone: [phone]
Email: [e-mail]
Europe
Barneveld, The Netherlands
Phone: [phone]
Email: [e-mail]
Canada
Brantford, ON
Phone: [phone]
Email: [e-mail]
México
Guadalajara, Jal.
Phone: [phone]
Email: [e-mail]
Australia
Waverley Gardens, VIC
Phone: [phone]
Email: [e-mail]
Not all parts or services available in all regions. Contact your regional o󰀩ce for information on available
parts and services.
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