Cat controls are one of two standard joystick configurations used to operate excavators. Named after Caterpillar because most Cat machines traditionally shipped with this layout, Cat controls follow the SAE standard and place boom control on the left joystick and dipper (stick) control on the right. The other common pattern, known as ISO or John Deere controls, flips those two functions. If you’re renting equipment, switching machines on a job site, or just learning to operate, understanding the difference matters for both productivity and safety.
How Cat Controls (SAE) Work
The Cat pattern uses two joysticks, each of which moves in four directions. Here’s what each movement does:
Left joystick (boom and swing):
- Toward you: Raise the boom
- Away from you: Lower the boom
- Left: Swing the cab left
- Right: Swing the cab right
Right joystick (dipper and bucket):
- Toward you: Pull the dipper (stick) toward the cab
- Away from you: Extend the dipper away from the cab
- Left: Curl the bucket closed
- Right: Open the bucket to dump material
The SAE designation comes from the Society of Automotive Engineers, the U.S. standards body that codified this layout. You’ll sometimes hear Cat controls called “backhoe controls” because the pattern mirrors how backhoe loaders have traditionally been set up.
Cat Controls vs. John Deere Controls
The difference between Cat (SAE) and John Deere (ISO) controls is smaller than most people expect. Swing and bucket functions are identical on both patterns. The only change is which joystick handles the boom and which handles the dipper. On ISO controls, the right joystick raises and lowers the boom while the left joystick controls the dipper. Cat controls reverse that assignment, putting the boom on the left and the dipper on the right.
That single swap can feel dramatic in practice. Operators build deep muscle memory around their preferred pattern, and the boom and dipper are the two functions you use most during a dig cycle. Pulling the left stick back to raise the boom becomes automatic after a few hundred hours in the seat. Jumping into a machine wired the opposite way means every instinct fires backward for those two critical movements.
Why Two Patterns Exist
Caterpillar and John Deere each standardized around a different layout during the early decades of hydraulic excavator manufacturing. Over time, operator familiarity became a competitive advantage. Once a customer spent years on Cat controls, switching to a John Deere machine meant relearning a core part of the job. The same worked in reverse. The two patterns effectively became a form of brand loyalty built into muscle memory.
Both configurations were eventually formalized by their respective standards organizations (ISO internationally, SAE in the United States), which is why the names stuck even as other manufacturers entered the market. Today, most excavator brands ship machines that can run either pattern.
How to Switch Between Patterns
Modern excavators from most manufacturers include a pattern changer that lets you swap between SAE and ISO without tools or mechanical knowledge. On John Deere machines, for example, the pattern control changer sits underneath the operator’s seat in a locked box. You unlock it with a key, loosen a single bolt, flip a lever, then re-secure everything. The whole process takes a few minutes.
Older machines can be more involved. Switching patterns on older models sometimes requires accessing the control valve assembly or junction box and physically swapping four pilot hoses. That’s a maintenance task, not something you do between shifts.
The ability to switch easily matters on job sites where multiple operators share equipment. A site with both Cat-trained and Deere-trained operators can accommodate everyone as long as the pattern gets changed before each new person climbs in the cab.
Why Consistency Matters for Safety
The biggest risk with dual-pattern machines is an operator who forgets to check which pattern is active before starting work. If you’re trained on Cat controls and the machine is set to ISO, pulling the left stick back will retract the dipper toward the cab instead of raising the boom. In tight spaces or near other workers, that unexpected movement can be dangerous.
The best practice is to pick one pattern and stick with it to reinforce muscle memory. If you operate across a mixed fleet, always verify the active pattern before you start digging. Many operators develop a habit of moving each joystick gently at the start of a shift to confirm which function is assigned where, well before the bucket gets near anything it could hit.
Which Pattern Should You Learn?
ISO controls are the more common setup globally and the default on most new excavators regardless of brand. If you’re just starting out and don’t have a fleet preference pushing you one direction, ISO is the safer bet for long-term versatility. That said, if you’re working primarily on Caterpillar equipment or in a shop that runs SAE across its fleet, learning Cat controls first makes practical sense.
Some experienced operators are comfortable with both patterns, but that level of adaptability takes significant seat time. For most people, committing to one pattern and building strong habits around it leads to smoother, safer operation than trying to stay fluent in both.