4 — MAINTENANCE
4-2 UNDERGUARD SERVICE CHECK
The underguard is a safety device located under the cage/platform that shuts down op-
eration of the lift when weight is applied. Perform the following procedure weekly to
verify the underguard is working properly.
1. Turn power to lift ON and raise cage/platform using the lower control box a
minimum of 3 feet above the underguard.
2. Place a weight of at least 15 lbs. on the underguard. Refer to Figure 4-1.
UNDERGUARD
UNDERGUARD
CLAMP
15 LB. WEIGHT
Figure 4-1. Underguard
3. BEFORE ATTEMPTING TO LOWER THE LIFT, MAKE SURE AREA
UNDERNEATH AND AROUND THE CAGE/PLATFORM IS CLEAR
OF PERSONNEL OR OTHER OBJECTS. Using the lower control box
with power ON, attempt to lower lift. A warning beeper should sound and the
lift should not lower. The lift should still be able to raise. With someone in the
cage, switch to upper controls and attempt to drive. A warning beeper should
sound and the lift should not drive.
4. If the lift lowers or drives, the switches below the underguard may need to be
adjusted or replaced. To adjust or replace underguard switches, shut power
OFF to lift, then remove two of the underguard clamps from one side of the
lift. The switches below the underguard can be adjusted by loosening the
screws or removed for replacement.
5. Retest whenever underguard is removed and switches are adjusted or replaced.
4-3
