Central Machinery 92804 User manual

AIR CONCRETE VIBRATOR
ASSEMBLY and OPERATING
INSTRUCTIONS
3491 Mission Oaks Blvd., Camarillo, CA 93011
Visit ourWeb site at http://www.harborfreight.com
For technical questions and replacement parts, please call 1-800-444-3353.
Model 92804
®
®
Copyright©2005 by Harbor Freight Tools®. All rights reserved. No portion of
this manual or any artwork contained herein may be reproduced in any shape or
form without the express written consent of Harbor Freight Tools.
TO PREVENT SERIOUS INJURY,
READ AND UNDERSTAND ALL WARNINGS
AND INSTRUCTIONS BEFORE USE.

Page 2SKU 92804 For technical questions, please call 1-800-444-3353
Specifications
SaveThis Manual
You will need the manual for the safety warnings and precautions, assembly instructions,
operating and maintenance procedures, parts list and diagram. Keep your invoice with this
manual. Write the invoice number on the inside of the front cover. Keep the manual and
invoice in a safe and dry place for future reference.
Safety Warnings and Precautions
WARNING: When using tool, basic safety precautions should always be followed to
reduce the risk of personal injury and damage to equipment.
Read all instructions before using this tool!
1. Keep work area clean. Cluttered areas invite injuries.
2. Observe work area conditions. Do not use machines or tools in damp or wet
locations. Don’t expose to rain. Keep work area well lit. Do not use electrically
powered compressors in the presence of flammable gases or liquids.
3. Keep children away. Children must never be allowed in the work area. Do not let
them handle machines, tools, extension cords, or air hoses.
4. Store idle equipment. When not in use, tools must be stored in a dry location to
inhibit rust. Always lock up tools and keep out of reach of children.
5. Use the right tool for the job. Do not attempt to force a small tool or attachment to
do the work of a larger industrial tool. There are certain applications for which this
tool was designed. It will do the job better and more safely at the rate for which it was
intended. Do not modify this tool and do not use this tool for a purpose for which it
was not intended.
6. Dress properly. Do not wear loose clothing or jewelry as they can be caught in
moving parts. Protective, electrically nonconductive clothes (including long pants) and
nonskid protective footwear are recommended when working. Wear restrictive hair
covering to contain long hair.
7. Use eye and ear protection. Always wear ANSI approved impact safety goggles and
noise dampening devices (i.e. earmuffs, ear plugs).Wear heavy work gloves.
8. Do not overreach. Keep proper footing and balance at all times.Do not reach over or
across running machines or air hoses.
Motor 3.6 HP, 3000 RPM (Free Speed 7900 RPM)
Maximum Air Pressure 90 PSI
Air Consumption 120 CFM @ 90 PSI
Starting Torque 5.3 FT/LBS
Stall Torque 8.7 FT/LBS
Air Inlet 1/2” - 14 NPT
Base Dimensions 19-1/4” L x 8-1/4” W x 9-3/4” H
Weight 46.25 LBS

Page 3SKU 92804 For technical questions, please call 1-800-444-3353
9. Maintain tools with care. Keep tools clean for better and safer performance. Follow
instructions for lubricating and changing accessories. Inspect tool cords and air hoses
periodically and, if damaged, have them repaired by an authorized technician.The
handle must be kept clean, dry, and free from oil and grease at all times.
10. Disconnect air supply.Disconnect air hose when not in use.
11. Remove adjusting keys and wrenches. Check that keys and adjusting wrenches
are removed from the tool or machine work surface before plugging it in.
12. Avoid unintentional starting. Be sure the regulator is in the Off position when not in
use and before plugging in.
13. Stay alert. Watch what you are doing, use common sense. Do not operate any tool
when you are tired.
14. Check for damaged parts. Before using any tool, any part that appears damaged
should be carefully checked to determine that it will operate properly and perform its
intended function. Check for alignment and binding of moving parts; any broken parts
or mounting fixtures; and any other condition that may affect proper operation. Any
part that is damaged should be properly repaired or replaced by a qualified
technician. Do not use the tool if regulator does not operate properly.
15. Replacement parts and accessories. When servicing, use only identical
replacement parts. Use of any other parts will void the warranty. Only use accessories
intended for use with this tool.
16. Do not operate tool if under the influence of alcohol or drugs. Read warning
labels if taking prescription medicine to determine if your judgement or reflexes are
impaired while taking drugs. If there is any doubt, do not operate the tool.
17. Use proper size and type extension cord. If an extension cord is required for the air
compressor, it must be of the proper size and type to supply the correct current to the
compressor without heating up. Otherwise, the extension cord could melt and catch
fire, or cause electrical damage to the compressor. Check your air compressor’s
manual for the appropriate size cord.
18. Maintenance. For your safety, maintenance should be performed regularly by a
qualified technician.
19. Compressed air only. Never use combustible gas as a power source.
20. WARNING: Some dust created by power sanding, sawing, grinding, drilling, and other
construction activities, contains chemicals known [to the State of California] to cause
cancer, birth defects or other reproductive harm. Some examples of these chemicals
are:
- Lead from lead-based paints
- Crystalline silica from bricks and cement or other masonry products
- Arsenic and chromium from chemically treated lumber
Your risk from these exposures varies, depending on how often you do this type of
work. To reduce your exposure to these chemicals: work in a well ventilated area, and
work with approved safety equipment, such as those dust masks that are specially
designed to filter out microscopic particles.
(California Health & Safety Code § 25249.5,
et seq. )

Page 4SKU 92804 For technical questions, please call 1-800-444-3353
21. This item creates powerful vibrations in both the workpiece and in the
operator’s body. Prolonged use could lead to personal injury.
22. Only use the ConcreteVibrator to vibrate and smooth wet concrete. Do not use
it on hard surfaces or you will damage the unit or cause personal injury.
Note: Performance of the compressor (if powered by line voltage) may vary depending on
variations in local line voltage. Extension cord usage may also affect tool performance.
Warning:The warnings,cautions,and instructions discussed in this instruction manual
cannot cover all possible conditions and situations that may occur. It must be under-
stood by the operator that common sense and caution are factors which cannot be
built into this product, but must be supplied by the operator.
For best service you should incorporate an oiler, regulator, and inline filter, as shown in the
diagram above. Hoses, couplers, oilers, regulators, and filters are all available at Harbor
FreightTools.
1. You will need to prepare an air connector (not included) to connect to the Air Inlet on
the Regulator (21), on the Concrete Vibrator. First, wrap the air connector with pipe
thread seal tape before threading it into the Air Inlet (see FIGURE 2 on page 5) on the
Regulator (21). Connect the air source hose to a quick connect coupler, and then to
the ConcreteVibrator. The air source hose must be a sufficient size to provide enough
air volume to operate this tool.
Note: Ifyouare notusing anautomatic oilersystem, before operation, adda few drops
of Pneumatic Tool Oil to the airline connection. Add a few drops more after each hour
of continual use.
2. Set the air pressure on the regulator to 90 PSI. Do not exceed the recommended air
pressure of 90 PSI.
3. Check the air connection for leaks. Disconnect from the air source.
Connecting the Air Supply
Unpacking
When unpacking, check to make sure that the product is intact and undamaged.If any
parts are missing or broken, please call Harbor Freight Tools at the number on the cover of
this manual as soon as possible.
Concrete
Vibrator

Page 5SKU 92804 For technical questions, please call 1-800-444-3353
Operation
2. After making sure the Base Unit is strapped securely in place using the metal
Support Bracket (20) surrounding it, attach the air hose source and turn on the air
compressor. We recommend having a second person to adjust the Regulator (21) for
power. DO NOT LET GO OFTHE CONCRETEVIBRATORTUBE HEADWHENTHE
UNIT IS ON. To adjust the Regulator (21), loosen the Lock Nut and adjust the air flow
using the Knob. After achieving the correct air flow, use a wrench to gently tighten the
lock nut. See FIGURE 2.
Knob
Air Inlet
Regulator (21)
Support Bracket (20) of
Base Unit
Lock Nut
FIGURE 1 Base Unit
Cylindrical Connector (A16)
Handle
Notches
Rod
WARNING! This Concrete Vibrator produces significant torque and vibration.
The elderly, infirm, and pregnant women should not use this device.
WARNING! THE BASE UNIT OFTHE CONCRETEVIBRATOR MUST BE SECURELY
STRAPPED DOWN BEFORE USE.
Refer to cover photo and the assembly diagrams.
WARNING: Only use the Concrete Vibrator to vibrate and smooth wet concrete. Do
not use it on hard surfaces or you will damage the unit or cause personal injury.
Connecting the Vibrating Head to the Base Unit
1. Insert the Rod on the center of the Cylindrical Connector (A16) into the center hole in
the end of the Base Unit.Align the notches on the bottom of the Cylindrical Connector
(A16) with the handle on the Base Unit. Turn the Handle to lock the Cylindrical Con-
nector (A16) into place. See FIGURE 1.
FIGURE 2
Operating the Unit

Page 6SKU 92804 For technical questions, please call 1-800-444-3353
Operation (continued)
Maintenance
Warning! Disconnect the Concrete Vibrator from the air source hose before attempting
any maintenance.
1. Clean the Vibrating Head immediately after each use, before any concrete dries on it.
Do not submerge the Base unit in water. Use a wet cloth to remove concrete from the
Vibrating Head. Do not use any harsh detergents or solvents to clean the Concrete
Vibrator.
2. Dry the Base Unit with a lint free cloth.
Note: Grip the Vibrating Tube Head just above where the Flex Tube (A13) connects with the
Casing (A4).
3. If necessary, shake theVibrator head to start the vibration. Keeping 3/4 of theVibrating
Headinside theconcrete,slowlymove it withinthe areayoudesire tosettle. Donot pull
the Vibrating Head out of the wet concrete with the unit on or wet concrete will vibrate
off the head covering the operator and the surrounding area. When you are finished,
have your partner turn off the air compressor and disconnect the air supply.
4. Loosening the Handle on the Base Unit (see FIGURE 1), remove the Vibrating Head
from the Base Unit.
5. Clean the concrete off of the unit and surrounding area before it dries.

Page 7SKU 92804 For technical questions, please call 1-800-444-3353
Motor Parts List
Motor Assembly Diagram
NOTE: Some parts are listed and shown for illustration purposes only and are not available
individually as replacement parts.
Part No. Description Qty.
1 Cylinder 1
2 Front End Plate 1
3 Rear End Plate 1
4 Rotor 1
4A Drive Key 1
5 Vane 4
6* Vane Spring 2
7* Vane Pin 4
8 Front Rotor Bearing 1
9 Rear Rotor Bearing 1
10 Rotor Shaft Seal 1
11 End Plate Gasket 2
12 Front End Cap 1
12A Front/Rear End Cap Screw 6
13 Front End Cap Seal 1
14 Rear End Cap 1
15 Rear End Cap Gasket 1
16 Muffler 1
17 Front/Rear End Plate Screw 12
18* Mounting Foot 4
19* Mounting Flange 4
20* Support Bracket 1
21* Regulator 1
* Not shown on the diagram.

Page 8SKU 92804 For technical questions, please call 1-800-444-3353
Vibrating Head Parts List
Part No. Description
A1 Cone
A2 Spacer
A3 Raceway
A4 Casing
A5 Rolling Body
A6 Oil Seal Ring
A7 Oil Seal Housing
A8 Oil Seal
A9 Bearing
A10 Pipe Adapter
A11 Shaft Adapter
A12 Flexible Shaft
A13 Flexible Pipe
A14 Cylindrical Plug
A15 Conical Sleeve
A16 Cylindrical Connector
PLEASE READTHE FOLLOWING CAREFULLY
THEMANUFACTURERAND/ORDISTRIBUTOR HAS PROVIDEDTHEPARTS DIAGRAMINTHIS
MANUAL AS A REFERENCE TOOL ONLY. NEITHER THE MANUFACTURER NOR DISTRIBU-
TOR MAKES ANY REPRESENTATIONORWARRANTYOFANYKINDTOTHE BUYERTHATHE
OR SHE IS QUALIFIED TO MAKE ANY REPAIRS TO THE PRODUCT OR THAT HE OR SHE IS
QUALIFIED TO REPLACE ANY PARTS OF THE PRODUCT. IN FACT, THE MANUFACTURER
AND/ORDISTRIBUTOREXPRESSLYSTATESTHAT ALLREPAIRSANDPARTSREPLACEMENTS
SHOULD BE UNDERTAKEN BY CERTIFIED AND LICENSEDTECHNICIANS AND NOT BYTHE
BUYER. THE BUYER ASSUMES ALL RISK AND LIABILITY ARISING OUT OF HIS OR HER
REPAIRS TO THE ORIGINAL PRODUCT OR REPLACEMENT PARTS THERETO, OR ARISING
OUT OF HIS OR HER INSTALLATION OF REPLACEMENT PARTS THERETO.
Vibrating Head Assembly Diagram