J&M 500ST - Manual (Page 23)

23
2.0 Service
2.9 Belt Tensioning
NOTE: You need to adjust your belt tension at least once a year.
1. Remove the head pan and head rubber discharge pan (Figure 2.3).
2. Loosen (Do Not Remove) the 4 bolts on the two bearing mounting plates located at the discharge end of
the conveyor (Figure 2.3).
3. Loosen jam nut on adjustment bolt at discharge end (Figure 2.3).
4. Torque threaded adjustment bolt to 23 ft-lb.
5. Operate the conveyor at a slow speed.
CAUTION: Keep hands and clothing away from moving parts.
6. If the belt is tracking properly go to step 7. If tracking is off, see Section 2.8.
7. Open the clean-out door located under collapsible hopper (Figure 2.4). This will allow you to see if
the belt is centered on the pulley.
8. If the tracking is ok, close the clean-out door, tighten all hardware and go to step 9. If tracking is off, see
Section 2.8.
9. Run the belt at medium speed for 10 min. and recheck the tracking at both the discharge and collapsible
hopper end.
10. If tracking is off, see section 2.8.
11. If the belt is still tracking in the center of both pulleys, reinstall the head pan.
2.10 Electric Brakes
The Speed Tender is equipped with electric brakes. They need to be inspected and serviced immediately if a loss
of performance is experienced. You need to service your Speed Tender brakes at least once a year with normal
use.
How to use your electric brakes properly:
Your Speed Tender brakes are designed to work in synchronization with your tow vehicle brakes. Never use your
tow vehicle or Speed Tender brakes alone to stop the combined load.
Your Speed Tender and tow vehicle will seldom have the correct amperage flow to the brake magnets to give you
comfortable, safe braking unless you make proper brake system adjustments. Changing trailer load and driving
conditions, as well as uneven alternator and battery output, can mean unstable current flow to your brake mag-
nets. It is therefore imperative that you maintain and adjust your brakes as set forth in this manual, use a properly
modulated brake controller, and perform the synchronization procedure noted below.
In addition to the synchronization adjustment detailed below, electric brake controllers provide a modulation
function that varies the current to the electric brakes with the pressure on the brake pedal or amount of deceler-
ation of the tow vehicle. It is important that your brake controller provide approximately 2 volts to the braking
system when the brake pedal is first depressed and gradually increases the voltage to 12 volts as brake pedal pres-
sure is increased. If the controller “jumps” immediately to a high voltage output, even during a gradual stop, then
the electric brakes will always be fully energized and will result in harsh brakes and potential wheel lockup.
To synchronize:
To insure safe brake performance and synchronization, read the brake controller manufacturer’s instruction com-
pletely before preforming the synchronization procedure.
Make several hard stops from 20 m/h on a dry paved road that is free of sand and gravel. If the Speed Tender
brakes lock and slide, decrease the gain setting on the controller. If they do not slide, slightly increase the gain
setting, Adjust the controller just to the point of impending brake lockup and wheel skid.