10-18-2025, 08:18 PM
How Hard Is It to Add a Third Valve to a CAT 953 or 963 Loader
The CAT 953 and 963 Loaders and Their Hydraulic Architecture
The Caterpillar 953 and 963 track loaders were introduced in the 1980s and 1990s as part of CAT’s push into versatile, mid-sized crawler loaders. With operating weights ranging from 30,000 to 40,000 lbs and bucket capacities between 2.0 and 3.5 cubic yards, these machines were designed for excavation, loading, and site preparation. Caterpillar, founded in 1925, has long emphasized modular hydraulic systems, allowing for customization based on jobsite needs.
The standard hydraulic setup on these loaders includes two main valves—one for lift and one for tilt. Adding a third valve enables operation of a 4-in-1 bucket, grapple, or other auxiliary attachment. This upgrade is common among contractors seeking more versatility without switching machines.
Terminology Notes
Adding a third valve is technically feasible but varies in difficulty depending on the loader’s age, hydraulic layout, and available space. Key components include:
Installation steps:
The cost of adding a third valve varies widely:
Operator Anecdotes and Practical Advice
One contractor in North Carolina added a third valve to his 953C using a salvaged valve block and a custom joystick switch. He reported that the hardest part was routing hoses through the loader arms without interfering with lift geometry. Another technician emphasized that older machines may lack space for solenoid mounting, requiring creative bracket design.
A fleet manager shared that his team retrofitted five 963s with third valves for 4-in-1 buckets used in demolition. He recommended using high-quality hose clamps and shielding to prevent abrasion from debris.
Preventive Measures and Long-Term Solutions
Adding a third valve to a CAT 953 or 963 loader is a practical upgrade that enhances versatility and jobsite efficiency. While the process requires hydraulic knowledge and careful routing, it’s well within reach for experienced technicians or well-equipped shops. Whether operating a 4-in-1 bucket or a grapple, the third valve transforms the loader into a multi-tool machine. In the world of earthmoving, control is everything—and the third valve puts it in your hands.
The CAT 953 and 963 Loaders and Their Hydraulic Architecture
The Caterpillar 953 and 963 track loaders were introduced in the 1980s and 1990s as part of CAT’s push into versatile, mid-sized crawler loaders. With operating weights ranging from 30,000 to 40,000 lbs and bucket capacities between 2.0 and 3.5 cubic yards, these machines were designed for excavation, loading, and site preparation. Caterpillar, founded in 1925, has long emphasized modular hydraulic systems, allowing for customization based on jobsite needs.
The standard hydraulic setup on these loaders includes two main valves—one for lift and one for tilt. Adding a third valve enables operation of a 4-in-1 bucket, grapple, or other auxiliary attachment. This upgrade is common among contractors seeking more versatility without switching machines.
Terminology Notes
- Third Function Valve: An additional hydraulic control valve used to operate auxiliary functions like bucket clamshells or forks.
- 4-in-1 Bucket: A multi-function bucket that can open, close, tilt, and carry, requiring separate hydraulic control.
- Electric-over-Hydraulic Control: A system where an electrical switch activates a hydraulic solenoid, allowing remote operation.
- Joystick Switch Integration: Mounting a control switch directly onto the loader’s joystick for ergonomic access.
Adding a third valve is technically feasible but varies in difficulty depending on the loader’s age, hydraulic layout, and available space. Key components include:
- Hydraulic control valve block with third section
- Solenoid actuator or manual lever
- Hydraulic hoses and fittings
- Wiring harness and switch
- Mounting brackets and hardware
Installation steps:
- Remove side panels and access hydraulic valve block
- Install third valve section or replace entire block with a three-function unit
- Route hoses to the front of the loader arms
- Mount solenoid and connect to switch wiring
- Test flow and pressure; adjust relief settings as needed
The cost of adding a third valve varies widely:
- OEM kits: $2,500–$4,000 depending on model and dealer markup
- Aftermarket kits: $1,200–$2,500, often requiring custom fabrication
- Labor: 8–16 hours depending on technician experience and loader condition
Operator Anecdotes and Practical Advice
One contractor in North Carolina added a third valve to his 953C using a salvaged valve block and a custom joystick switch. He reported that the hardest part was routing hoses through the loader arms without interfering with lift geometry. Another technician emphasized that older machines may lack space for solenoid mounting, requiring creative bracket design.
A fleet manager shared that his team retrofitted five 963s with third valves for 4-in-1 buckets used in demolition. He recommended using high-quality hose clamps and shielding to prevent abrasion from debris.
Preventive Measures and Long-Term Solutions
- Use OEM or high-quality aftermarket valves to ensure compatibility
- Label all hydraulic lines and switches for future maintenance
- Inspect hose routing monthly for wear or interference
- Document installation steps and part numbers for resale and service
- Train operators on third function use to prevent overloading or misactivation
Adding a third valve to a CAT 953 or 963 loader is a practical upgrade that enhances versatility and jobsite efficiency. While the process requires hydraulic knowledge and careful routing, it’s well within reach for experienced technicians or well-equipped shops. Whether operating a 4-in-1 bucket or a grapple, the third valve transforms the loader into a multi-tool machine. In the world of earthmoving, control is everything—and the third valve puts it in your hands.
