Skyjack SJIII Pre-Rental Inspection: 5-Minute Yard Walkaround
Why Pre-Rental Beats Post-Rental Phone Calls
Every rental yard mechanic has gotten the call: customer is on a job site, lift won't lift, billable hours stacking up, somebody has to drive out. A pre-rental inspection is the cheapest insurance against that call. Five minutes in the yard catches 80 percent of the problems that cause customer callbacks on Skyjack SJIII scissor lifts. This walkaround is what experienced fleet techs actually do, in the order that finds problems fastest.
Step 1: Visual Walkaround (60 seconds)
Walk the lift starting at the front-left tire and going clockwise. Look for: tire damage or low pressure (solid foam-fill tires don't go flat but can chunk). Hydraulic leaks under the chassis, especially at the lift cylinder rod and hose fittings. Damaged or missing platform railing. Cracked or fogged platform display. Loose or missing safety decals. Anything bent, leaking, or missing gets the lift pulled. Customers will photograph existing damage; get ahead of disputes by documenting what you find.
Step 2: Battery Box Open (30 seconds)
Pop the battery box on the side of the chassis. Confirm electrolyte level above the plates on at least one cell (top-up if needed). Look for white or green corrosion on terminals -- if you find any, the lift goes to the bench for cleaning, not out. Check the charger plug for damage. Make sure the disconnect switch is in the ON position. Battery problems are the number one cause of Skyjack callbacks, mostly traced to undercharged packs from prior rentals.
Step 3: Ground Controls Function Test (60 seconds)
Key the lift on at the ground controls. Confirm the platform display reads battery state of charge above 80 percent. Cycle the platform up about 3 feet using ground controls, then down. Listen for hydraulic pump noise that doesn't sound right (whining, cavitation, or relief-valve squeal at full pressure). The lift should rise and lower smoothly. Any code on the platform display gets investigated -- battery, tilt, and pothole-guard faults are common categories, but exact code numbers vary across the SJIII generations and sub-models, so verify against your specific unit's service manual rather than a generic list. All codes have to be cleared and root-caused before dispatch.
Step 4: Platform Controls Test (60 seconds)
Climb on the platform. Key the lift up at the controls. Cycle: lift up to roughly 8 feet, drive forward 6-8 feet, drive reverse back, lift down. Pothole guards should deploy when elevated and retract when stowed -- listen for the click. Tilt alarm should not sound on level ground. Joystick should self-center cleanly when released. If anything is sticky, drifting, or not centering, the lift goes to the bench.
Step 5: Outrigger / Tilt Bypass Check (Skip on SJIII)
SJIII electric scissors don't have outriggers. Skip this step. On rough-terrain SJ-RT models, manually deploy and stow each outrigger and confirm the limit switches register. Pin sensors get dirty in muddy field conditions and start throwing 13 (pothole guard) or related faults inappropriately. Clean any dirty sensors with brake clean and a rag while the lift is in front of you.
Step 6: Documentation
Update the rental fleet log with: hours at dispatch, fuel/charge state, any current codes (cleared or not), photos of any cosmetic damage. Sign off the inspection. If your shop uses a yard tag system, attach the green tag. The 5 minutes you spent here saves a 90-minute service call when the next customer calls in panic. And if a customer does call, you have the documentation to verify the lift left the yard healthy.
Common Issues This Catches
The five problems this walkaround catches most often: (1) Undercharged battery from the prior rental ending early -- 02-style codes the moment the lift sees load. (2) Pothole guard limit switches misadjusted from a transport bump. (3) Joystick that doesn't self-center, leading to operator complaints about creep. (4) Hydraulic leak at the platform-side hose that drips on the operator. (5) Loose ground controls cover that lets rain into the controller. Five problems, five minutes -- and zero phone calls from a frustrated foreman at 2 PM on a Tuesday.