maintenance
changing blades
It is recommended that ALL the blades on the trowel are changed at the same time. If only one or some of the blades are changed, the machine will not finish concrete consistently and the machine may wobble or bounce.
Perform the following procedure when changing blades: Please note the blade orientation on the trowel arm before removing.
1.Lift the trowel up, placing blocks under the main guard ring to support it.
2.Remove the bolts and lock washers from all the towel arms, and then remove the blades as shown in Figure 52.
BLADE
ATTACHMENT
SCREWS
TROWEL ARM
BLADE
ATTACHMENT
BAR
TROWEL
BLADE
Figure 52. Blade Removal
3.Wire brush and remove all concrete and debris from all six sides of each of the four trowel arms. This is important to properly seat the new blades.
4.Install the new blades, maintaining the proper blade orientation for direction of rotation.
5.Reinstall the bolts and lock washers.
Trowel arm removal
1.Each trowel arm is held in place at the spider plate by a hex head bolt (zerk grease fitting) and a roll pin. Remove both the hex head bolt and the roll pin (Figure 53) from the spider plate.
2.Remove the trowel arm from the spider plate.
3.Should the trowel arm inserts ( bushing ) come out with the trowel arm, remove the bushing from the trowel arm and set aside in a safe place. If the bushing is retained inside the spider plate, carefully remove the bushing
4.Examine the trowel arm bushing insert (Figure 53), clean if necessary. Replace bushing if out of round or worn.
SPIDER PLATE
ROLL PIN
TROWEL
ZERKARM
CAP GREASE FITTING
BUSHING
Figure 53. Trowel Arm Removal
page 34 — b46S90
