Stow SFG10E manual SpacerWasher, Scarifier Block Bushing

ASSEMBLY INSTRUCTIONS/OPERATIONS

that particular area. As a general rule, a pentagonal flail can be utilized until body wear will no longer support the tungsten carbide inserts.

SpacerWasher

Spacer washers are stamped from high carbon steel and heat-treated for additional service life. FIGURE 10. Spacer washers serve the following functions:

Scarifier Block Bushing

Scarifier block bushings are designed to be discarded whenever the flails are replaced. FIGURE 11. Normal wear should be uniform about the bushing circumference.

Uneven bushing wear would suggest the following problems:

FIGURE 10

1)Reduces the number of flails required to be mounted on the scarifier block, thus reducing purchase and operational costs.

2)Arrange the flails in a sequence or pattern that minimize “blind” or “open” spots. Normally, at least one spacer washer is inserted between two consecutive flails. A scarifier block set up with only star, beam or pentagonal flails will not penetrate the work surface at satisfactory rates. This configuration will minimize the hammering or impact action of the flails.

Variances in material thickness and manufacturing processes can affect the final thickness of both flails and spacer washers. Because of this occurrence, trial and error is important for assembling flails and spacer washer on the scarifier block. By mixing and matching flails and spacer washers of specific thicknesses, the required number of components can be assembled on a block in a minimum amount of time.

DANGER

USE ONLY FACTORY SUPPLIED SPACERWASHERS ONTHE SCARIFIER BLOCK. OTHERWASHERTYPES AND/OR CONFIGURATIONS CAN PRODUCE ABNOR- MAL WEAR AND ELONGATION, RESULTING IN COMPLETE SEPARATION FROM THE SCARIFIER BLOCK. INADVERTENT SPACERWASHER SEPARA- TION CAN LEAD TO PROPERTY DAMAGE AND/OR PERSONAL INJURY.

FIGURE 11

1)Inadequate free play exists between the flails/spacer washers and the scarifier block case. If the flails and spacer washers do not have complete freedom of movement, they will not be capable of properly rotating about the scarifier block bushing. The result is bushing wear usually confined to two locations that are 180 degrees apart. Variances in flail and spacer washer thicknesses affect free play when assembled on the scarifier block.

Because free play is also created during the scarifying process due to actual flail and spacer washer wear, a certain amount of “tightness” can sometimes be tolerated without affecting the service life of the bushings and flails. The specific amount of “tightness” can usually be determined through trial and error. If the flails and spacer washers appear too tight on the scarifier block, remove an appropriate flail or washer and reassemble the block. If a short, operational test indicates normal component wear patterns, the apparent problem has been solved. A general rule for consideration: it is better to have the flails and spacer washers a “little too loose than a little too tight”.

2)Mixing both worn and new flails on the scarifier block. Proper flail action against the work surface material requires that the flails be of the same approximate dimensions. Flails with various inside and outside dimensions will not impact the work surface material with the same intensity and deliver the same results. Flail bushing wear is directly proportional to the amount of force it must supply against each individual flail.When a bushing can no longer supply adequate force against the flails, it will break, allowing the flails to be hurdled

SFG10E ELECTRIC SURFACE GRINDER — OPERATION AND PARTS MANUAL — REV. #1 (07/16/07) — PAGE 16