Hydraulic mulchers and brush cutters need a steady supply of hydraulic flow to run. If your tractor can’t provide enough, a PTO-driven power pack can. It takes power from your tractor’s PTO and turns it into a dedicated hydraulic supply for the attachment.
Here are the specs for Forax’s PTO-driven power pack (PTOPP), and what to check before pairing it with a mulcher.
The Short Answer
The Forax PTO power pack is rated at 20.8 gal/min (GPM) at 540 PTO rpm.
Full Specifications
All figures are at 540 PTO rpm:
- Hydraulic flow rate: 20.8 gal/min
- Hydraulic pressure: 2,200 psi
- Tank capacity: 25 gallons
- Hydraulic fluid: AW46
How the Power Pack Compares With Forax Attachments
Forax lists a hydraulic flow requirement for each of its hydraulic attachments:
| Attachment | Listed hydraulic flow |
|---|---|
| HP40 Ultra Light Mulcher | 12 gal/min |
| HDBC Heavy Duty Brush Cutter | 20-30 gal/min |
| HD72 Heavy Duty Mulcher | 25-30 gal/min |
Based on these numbers:
- The HP40’s 12 gal/min requirement is below the pack’s 20.8 gal/min rating.
- The HDBC’s 20-30 gal/min range includes the pack’s 20.8 gal/min rating.
- The HD72 needs 25-30 gal/min, which is more than the pack’s 20.8 gal/min. Don’t assume the two work together.
These are comparisons of published numbers, not compatibility guarantees. Confirm any pairing with Forax or our team before you buy.
Where Does the GP40 Fit In?
The Forax GP40 Gas Powered Mulcher doesn’t need a power pack at all. It runs on its own 14 hp gasoline engine, so it needs no PTO or tractor hydraulics. The power pack is for Forax’s hydraulic units.
What to Check Before You Buy
- Does your tractor have a 540 rpm PTO? The pack’s specs are rated at 540 PTO rpm.
- Does the flow match your attachment? Compare the attachment’s listed gal/min with the pack’s 20.8.
- Do you have the right fluid? Forax specifies AW46 hydraulic fluid, and the 25-gallon tank needs to be filled with it.
- Do you have room to carry and plumb it? A 25-gallon tank adds bulk and weight, so plan for where it will sit and how the hoses will run.
Frequently Asked Questions
What is the GPM rating of the Forax PTO power pack?
20.8 gal/min at 540 PTO rpm.
What is its pressure rating?
2,200 psi at 540 PTO rpm.
How big is the tank, and what fluid does it use?
25 gallons, with AW46 hydraulic fluid.
Can it run the HD72 mulcher?
The HD72 is listed at 25-30 gal/min, which is higher than the pack’s 20.8 gal/min. Check with Forax before pairing them.
Does the GP40 need the power pack?
No. The GP40 has its own gas engine.
Need Help Matching a Power Pack to a Mulcher?
Tell us your tractor and the attachment you’re considering and we’ll help you work out the setup. Contact Forestry Pro Supply.