Gravitron 8000 General Troubleshooting; Gravitron 8000 Specific Troubleshooting - Stairmaster Freeclimber series Service Manual

LEAK TEST
1. Press 2020, Enter, Enter to engage compressor.
2. Let compressor run until the number in the workout weight window reaches 100.
3. Press Enter to stop compressor.
4. Wait 3 minutes and record number from workout weight window.
* This test should be performed once while standing on the platform and once off the platform. This will test
both the upper and lower seals inside the cylinder.
CALIBRATION - WITH PRESSURE GAUGE
1. Press 2020, Enter, Enter, to engage compressor.
2. Let compressor run until pressure gauge reaches 75 PSI.
3. Press Enter to stop compressor.
4. Record number in workout weight window.
5. If number recorded is 128, then machine is properly calibrated. End test.
6. To calibrate machine, use gain adjustment screw on the power module to raise or lower number in
workout weight window as needed.
7. Run test again to double check adjustment accuracy.
CALIBRATION - WITHOUT PRESSURE GAUGE
1. Place exactly 100 lb. (dumbbells, weight plates, etc.) on platform.
2. Program a workout for a 200-lb. person at level 9.
3. After compressor turns off, lift the platform assembly up to full extension.
4. Slowly lower platform assembly until it stops on its own.
5. The platform should stop half way between the floor and full extension to be adjusted correctly. The
lift beam assembly should be parallel with the floor.
6. YOU MUST RESET the workout and program another in order to calibrate correctly. Use the gain
adjustment screw on the power module to calibrate.
SAFETY VALVE ADJUSTMENT
1. Program a workout while standing on the lift platform.
2. After compressor stops, step off platform quickly.
3. Platform should rise 8-12 inches and stop if set correctly.
4. If platform rises less than 8 inches, the adjustment screw on the safety valve should be turned
counter clockwise 1/8 turn for each 2 inches added.
5. If platform rises more than 12 inches, the adjustment screw on the safety valve should be turned
clockwise 1/8 turn for every 2 inches subtracted.
6. If platform stops only at full extension, turn the adjustment screw clockwise 1 complete turn and
retest.
7. If platform will not rise off the floor, turn the adjustment screw counter clockwise 1 turn at a time.
GRAVITRON ® 8000 TROUBLESHOOTING
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