Adjustments are made by tightening or loosening the blade pitch adjustment bolt (Figure 24).
Figure 24. Blade Pitch Adjustment Bolt
1.Spider Plate
2.Blade Pitch Adjustment Bolt
3.Trowel Lever
4.Trowel Arm
5.Trowel Blade
The easiest and most consistent way to make this adjustment is to use the Trowel Arm Adjustment Fixture (P.N. 9177) that is manufactured by Whiteman Industries. This fixture will allow consistent adjustment of the trowel arm fingers. It comes with all the hardware necessary to properly accomplish this maintenance and instructions on how to properly utilize this tool. Adjusting the trowel arm fingers without a fixture requires a special talent.
If a trowel arm adjustment fixture is not available and immediate adjustment is necessary; we suggest the following procedure. If you can see or feel which blade is pulling harder, adjust the bolt that corresponds to that blade. Another way to determine which blades need adjustment is to place the machine on a flat surface and pitch the blades as flat as possible. Now, look at the adjustment bolts. They should all barely make contact with the lower wear plate on the spider. If you can see that one of them is not making contact; some adjustment will be necessary.
It will be possible to adjust the “high” bolts down to the level of the one that is not touching, or adjust the “low” bolt up to the level of the higher ones. If possible, adjust the low bolt up to the level of the rest of the bolts. This is the fastest way, but may not always work. Verify that after adjustment, the blades pitch correctly. Often times, if the blades are incorrectly adjusted, they will not be able to pitch flat. This occurs when the adjusting bolts have been raised too high. Conversely, sometimes the adjusting bolts are too low and the blades cannot be pitched high enough for finishing operations.
STX-SERIES — MAINTENANCE
Changing A Blade
It is recommended that all the blades on the entire machine are changed at the same time. If only one or some of the blades are changed at one time, the machine will not finish concrete consistently and the machine may wobble or bounce.
1.Place the machine on a flat, level surface. Adjust the blade pitch control to make the blades as flat as possible. Note the blade orientation on the trowel arm. This is important for
2.Remove the bolts and lock washers on the trowel arm, and then remove the blade. (Access is easier if the steps are removed.)
3.Scrape all concrete and debris from the trowel arm.This is important to properly seat the new blade.
4.Install the new blade, maintaining the proper orientation for direction of rotation.
5.Affix the bolts and lock washers.
6.Torque to 9 ft. lbs.
7.Repeat steps