Please post the full machine serial number and I will see what I can find.
SLA00876Arrangement No:(###) ###-####br />Mfg Model: TH220BMktg Model Year: 2005Prod Family: TH Th TelehandlersSims Prod Family: 30 Material Handlers - TelescopicSource Facility: 34 Cat (U.K.) Ltd -LeicesterPrinciple Work: 255 DemolitionBuild Date: 26Jul2005Factory Ship Date: Not ApplicableDealer/Invoiced Ship Date: 26Aug2005Sales Date: 30Sep2005Delivery Date: 30Sep2005
I believe all CAT Telehandlers were built in the UK. (Not sure where JLG branded machines are built.) This machine was originally sold in South Carolina USA and the re-sold to Kelly tractor in Florida USA. No further records are visible to me so, I would assume that is when it went across the pond to you.
Being this is an electronic engine, have you viewed the fault codes?
If so, please post the codes you have and we can work further on them first.
Below is a list of issues the affect throttle control.
Troubleshooting 3054E Engines for Caterpillar Built Machines
Media Number -RENR2417-12 Publication Date -01/08/2008 Date Updated -05/08/2008
Can Not Reach Top Engine RPM
Note: If this fault occurs only under load, refer to Troubleshooting, "Low Power/Poor or No Response to Throttle".
Check for active diagnostic codes on the electronic service tool. Troubleshoot any active codes before continuing with this procedure.
Throttle Position Sensor
Air Intake and Exhaust System
Individual Malfunctioning Cylinders
Fuel Injection Nozzles
I have seen problems with both. The old sensor had issues with moisture and the new sensor is plastic and can be damaged easily.
Be careful you do not overtighten the mounting screws.
I would replace it if it has throttle related fault codes just to know that it is not the cause of the codes. (Save the old one just in case the engine software has trouble using the newer type sensor. It has happened and the older part number may work better.)
Thanks for the reply and accepting my answer.
I will be glad to help as much as I can. Hopefully, the dealer technician can find the issue and fix it the same trip.
I would suggest you ask them to bring a sensor with them. If they have it in stock and don't need it, (leave box unopened) they can return it without charges.
It is possible to view the codes using the instrument panel. It is difficult to key the correct key sequence (timing when to turn the key on and off) but the hour meter can show some of the fault codes. (Some engine codes may not appear in the display but, it should show the pedal and other external faults.)
I will attach a file to show you how to access this feature.