Section 4 • Repair Procedures
March 2007
SCISSOR COMPONENTS
REV C
10 Models with round pressure switch: Remove the retaining ring securing the cover to the pressure switch and remove the cover. Using a flat blade, turn the slotted switch adjustment screw of the platform overload pressure switch into the hydraulic line in 90° increments until the overload alarm does not sound. Models with box-shaped pressure switch: Remove the fasteners securing the cover to the pressure switch and remove the cover. Using a wrench, turn the nut of the platform overload pressure switch into the hydraulic line in 90° increments until the overload alarm does not sound.
15 Using a suitable lifting device, place a test weight in the center of the platform floor. Secure the weight to the platform. Refer to the chart below. GS-1532
272 kg
GS-1932
227 kg
GS-2032
363 kg
GS-2632
227 kg
GS-3232
227 kg
GS-2046
544 kg
Note: To allow the platform overload system to reset, the red Emergency Stop button must be cycled after each quarter turn of the nut or slotted switch adjustment screw.
GS-2646
454 kg
GS-3246
317 kg
Note: Turning the nut or slotted switch adjustment screw into the hydraulic line will deactivate the alarm; turning the nut or slotted switch adjustment screw out of the hydraulic line will activate the alarm.
16 Raise the platform to 25 cm less than full height.
11 Slowly turn the nut or adjustment screw of the platform overload pressure switch out of the hydraulic line just until the overload alarm sounds. Note: To allow for the platform overload system delay, wait 3 seconds between each quarter turn of the nut or adjustment screw.
17 Lift the safety arm, move it to the center of the scissor arm and rotate down to a vertical position. 18 Raise the platform in 5 cm increments until the overload alarm sounds. Adjust the up limit switch until it actuates just before this point was reached. 19 Install the cover onto the platform overload pressure switch and install and tighten the cover retaining fastener(s). Do not over tighten.
12 Turn the nut or adjustment screw one quarter turn into the hydraulic line.
20 Apply Sentry Seal to the fastener(s) securing the cover onto the platform overload pressure switch.
13 Return the safety arm to the stowed position.
21 Return the safety arm to the stowed position.
14 Using the manual lowering knob, lower the platform to the stowed position and remove all test weight from the platform.
22 Using the machine controls, lower the platform to the stowed position and remove all test weight from the platform. 23 Calibrate the lift relief valve. See 6-6, How to Adjust the Platform Lift Relief Valve.
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GS-30 • GS-32 • GS-46
Part No. 97385