01
Thumb
1 double-acting circuit
Open and close the thumb on a proportional roller. Feather it against the load instead of slamming it shut.
Parts/Hydraulic kits
Parts · Auxiliary hydraulic kits
Control at
your thumb.
Proportional auxiliary hydraulic kits for excavators — machine-specific hard lines, proportional valves and proportional joysticks, built for your make and model. Quality kits at a much more affordable price.
01 — Kits by function
One kit for
each job.
Pick the attachments you run. Combination kits put two or more circuits on one machine, each on its own control.
02
Hammer / breaker
1 one-way circuit
Flow and pressure set to your hammer, with a low-restriction return and case drain where the hammer calls for one.
03
Tilt & rotate
2 circuits
Rotate and tilt each on their own roller, for tilt buckets, rotating grapples and tiltrotators.
04
Shear & processor
High-flow two-way + rotate
High-flow two-way for the jaws and a separate proportional rotate circuit for positioning.
05
Rock saw & augers
1 one-way or two-way circuit
Steady, adjustable flow for rock saws, augers, compactors and other motor-driven attachments.
06
Custom / conversion
Built to spec
Converting an on/off kit to proportional, adding a circuit to an existing kit, or something not listed here.
02 — What's in the kit
Valve to joystick.
Nothing left to source.
Every kit arrives complete for your machine, plus install instructions and a hydraulic schematic.
- Proportional joysticksReplacement grips with thumb rollers and buttons, pre-wired with a plug-in harness.
- Proportional valve blockElectro-hydraulic valve sized to the circuits and flows your attachments need.
- Proportional driverController that turns roller travel into smooth, adjustable flow, set per attachment.
- Machine-specific hard linesBoom and stick tubes bent to your model, painted, and capped for shipping.
- Hoses & fittingsCrimped hoses, adapters, tees and quick-coupler whips with caps, cut to length.
- Clamps, brackets & platesLine clamps, valve mounting plates and brackets to mount the kit cleanly.
Illustrative kit layout. Configuration varies by machine.
03 — Why GoodRock kits
Built right.
Priced right.
Built for your machine
Every kit starts from your make, model and PIN. Hard lines are bent to your boom and stick; the valve, driver and harness are matched to your hydraulics and electrics.
Proportional, not on/off
Rollers give variable speed in both directions, so a thumb can be feathered, a rotator placed to the degree, and a hammer run at the flow it was built for.
Quality without the dealer price
Proportional kits are usually the most expensive way to add auxiliary hydraulics. Ours use quality valves, joysticks and hoses at a much more affordable price.
Install support
Each kit ships with install instructions and a hydraulic schematic, and we're an email away while your mechanic sets it up.
04 — Configure a kit
What will it run?
Functions · choose one or more
Controls
Machine size
Your kit
Thumb kit
Quoted to your machine — every kit is specced from your make, model and PIN.
Add machine details05 — How it works
From machine PIN
to install.
01
Send your machine
Make, model, PIN and the attachments you want to run. Photos of the main valve and the joysticks help.
02
We spec the kit
Circuits, flows, joystick layout and line routing confirmed for your machine, then a complete quote.
03
We build it
Lines, valve, driver and harness built and checked as one kit for your machine.
04
Install & set up
Your mechanic installs it with our instructions and schematic; we help set flows for each attachment.
Request received
Thank you.
We'll identify the kit and come back to you by email within 48 hours.
One more step
Send it to us by email.
Our form couldn't send this one. Your request is written out below. Send it with Gmail or Outlook, or copy it into any email to info@goodrockattachments.com, and attach your photos to that email.
Request a kit quote
Tell us the machine.
The PIN tells us which lines and valve fit your machine. Photos of the main control valve and both joysticks help us spec it right.
Questions
Kit FAQ.
What's the difference between a proportional kit and an on/off kit?
An on/off kit opens the circuit fully when you press a button, so the attachment runs at one speed. A proportional kit uses a roller and a proportional valve, so speed follows how far you move the roller. That control matters most on thumbs, rotators, tilt buckets and shears.
Will it fit my excavator?
Kits are built per machine. Send the make, model and PIN and we'll confirm the kit for your machine before you order, including anything that differs from a standard install.
Can I run more than one attachment?
Yes. Combination kits run two or more circuits, for example a hammer and a thumb, or tilt and rotate, each on its own control.
Can my own mechanic install it?
Yes. Kits ship with install instructions, a schematic and a parts list, and we support the install by email.
How much does a kit cost?
It depends on the machine, the number of circuits and the controls. Every kit is quoted to your machine, with shipping, and priced well below what proportional kits usually cost.