HTH — MAINTENANCE
Changing A Blade
Whiteman recommends that all the blades on the entire ma- chine be 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.
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.Repeat steps
Checking Hydraulic Pressure
It should be mentioned that most hydraulic problems are a result of low fluid levels. Before checking any other possibilities, make sure the hydraulic fluid level is half way up the sight glass which is located at the right end of the frame.
Hydraulic pressure can be checked using a pressure gauge (Figure 18) with a range of at least 5,000 psi.The pressure taps are located on the front side of the hydraulic pumps on elbows. The 1/8" pipe plugs can be removed and a hose, attached to the gauge, screwed into each port. It is best to use two gauges simultaneously, but it is possible to use only one gauge and repeat the procedure for each side.
To fully test the hydraulic system, the spiders will need to be locked so that they cannot rotate. This can easily be done by wrapping a chain around an arm on each spider, thus chaining them together in the back of the trowel.
Once the pressure gauges are installed and the spiders chained together, the system can be checked.
With the foot pedal in the idle position and the engine at full speed, the pressure should be 200 to 300 psi. If the pressure is less than 200 psi, the charge system may need to be inspected and/ or serviced. In particular, the suction filter and charge pump relief valve should be checked. The suction filter may be plugged, or the relief valve may be stuck. Either condition may cause low charge pressure.
With the engine at 50% to 70% of full speed, and spiders chained together, slowly depress the foot pedal and read the gauges. The pressure should get to at least 3,100 psi. If the pressure will not attain 3,100 psi, the pump should be inspected and/or serviced by an authorized service representative.