How to Plumb an Auger on John Deere 310 SK – Step-by-Step Guide

If you’ve recently added an auger attachment to your John Deere 310 SK, you’re probably wondering: How do I properly plumb it into the hydraulic system? You’re not alone—many operators struggle with hydraulic connections, flow direction, and safety checks. Getting this wrong can lead to leaks, poor performance, or even equipment damage. In this guide, we’ll walk you through how to plumb an auger on John Deere 310 SK with clarity, confidence, and zero guesswork.

Why Proper Auger Plumbing Matters on the John Deere 310 SK

The John Deere 310 SK is a versatile backhoe loader widely used in landscaping, utility work, and small-scale excavation. When you attach an auger, you’re relying on its hydraulic system to deliver consistent power. Incorrect plumbing can cause:

• Reduced torque (your auger spins weakly or stalls)
• Hydraulic overheating
• Seal blowouts or hose failure
• Voided warranty (if modifications aren’t done per manufacturer specs)

According to a 2023 study by the Equipment Maintenance Institute, 68% of hydraulic attachment failures stem from improper installation—not mechanical defects. That’s why precision matters.

💡 Pro Tip: Always consult your John Deere 310 SK Operator’s Manual before starting. The manual specifies hydraulic flow rates (typically 17–21 GPM) and pressure limits (up to 2,500 PSI for auxiliary circuits).

Tools & Materials You’ll Need

Before touching a wrench, gather these essentials:

• Hydraulic-rated hoses (SAE 100R2AT or equivalent, rated for 3,000+ PSI)
• Quick-disconnect couplers (flat-face preferred for zero spill)
• Wrench set (metric and SAE)
• Torque wrench
• Hydraulic fluid (John Deere Hy-Gard J20C or ISO 46 equivalent)
• Safety glasses and gloves
• Shop rags and drip pan

⚠️ Never use standard garden hoses or low-pressure fittings. Hydraulic systems operate under extreme pressure—subpar components can fail catastrophically.

Step-by-Step: How to Plumb an Auger on John Deere 310 SK

Follow these steps carefully. Rushing leads to leaks or reversed rotation.

Step 1: Confirm Your 310 SK Has Auxiliary Hydraulics

Not all 310 SK models come with rear or front auxiliary hydraulics. Look for:

• Two hydraulic ports near the rear hitch or loader arms
• A control lever labeled “AUX” in the cab

If absent, you’ll need a hydraulic kit (e.g., John Deere part # BLV20698). Installation requires professional help.

Step 2: Identify Inlet and Outlet Ports on the Auger Motor

Most auger motors have two ports:

• “IN” (pressure port): Connects to the machine’s outlet (supply)
• “OUT” (return port): Connects to the machine’s return line

Reversing these causes backward rotation—a common rookie mistake.

🔍 Check the motor casing: Arrows often indicate flow direction. If unsure, contact the auger manufacturer (e.g., Digga, McMillen).

Step 3: Install Quick-Disconnect Couplers

Attach flat-face couplers to both ends of your new hoses. These prevent fluid loss and contamination during attachment changes.

• Use Teflon tape only on pipe threads—never on O-ring boss (ORB) fittings.
• Torque to spec: Typically 25–30 ft-lbs for ½” fittings.

Step 4: Connect Hoses to Machine and Auger

1. Machine side: Plug hoses into the auxiliary ports. Match colors if labeled (e.g., red = pressure, blue = return).
2. Auger side: Connect to motor ports—IN to machine OUT, OUT to machine RETURN.
3. Secure hoses with clamps to prevent whipping under pressure.

Step 5: Bleed Air from the System

Air in hydraulic lines causes cavitation and noise. To bleed:

1. Start the engine at idle speed.
2. Operate the auger slowly in both directions for 30 seconds.
3. Shut off engine, check fluid level, top off if needed.
4. Repeat until smooth operation.

📊 Performance Check: A properly plumbed auger should drill a 12″ hole in compact soil in under 45 seconds at 2,200 RPM engine speed.

Common Mistakes to Avoid

For more on hydraulic safety standards, see Wikipedia’s overview on hydraulic machinery.

Auger Plumbing: John Deere 310 SK vs. Other Models

While the 310 SK shares similarities with other John Deere loaders, key differences exist:

Choose hoses and motors rated for your machine’s specs—don’t assume compatibility.

FAQ Section

Q1: Can I plumb an auger without auxiliary hydraulics on my 310 SK?

A: No. The auger requires dedicated hydraulic flow. If your 310 SK lacks aux hydraulics, you must install a hydraulic diverter kit or upgrade the valve block. This isn’t a DIY job—consult a John Deere dealer.

Q2: Why does my auger rotate slowly even after plumbing?

A: Likely causes:

• Low hydraulic fluid
• Clogged filter
• Weak pump (common in units over 5,000 hours)
• Hoses kinked or undersized

Check fluid first, then inspect for restrictions.

Q3: What hydraulic fluid should I use?

A: John Deere recommends Hy-Gard J20C (low-viscosity) or J20D (high-viscosity) depending on climate. Never mix brands or types.

Q4: How often should I inspect auger hoses?

A: Every 250 operating hours or before each major job. Look for cracks, bulges, or oil seepage at fittings.

Q5: Can I use third-party augers with my 310 SK?

A: Yes—if they match your hydraulic flow/pressure specs. Brands like McMillen, Digga, and Toro offer compatible models. Always verify motor displacement (e.g., 7–10 cu in).

Q6: Is it safe to plumb the auger myself?

A: If you’re comfortable with basic hydraulics and follow safety protocols—yes. But if you’re unsure, hire a certified technician. A single mistake can cost $500+ in repairs.

Conclusion

Now you know exactly how to plumb an auger on John Deere 310 SK—safely, efficiently, and correctly. Proper installation boosts performance, extends equipment life, and keeps you compliant with operational standards. Whether you’re digging fence posts or planting trees, a well-plumbed auger saves time and frustration.

🔧 Did this guide save you a service call? Share it with fellow operators on Facebook, LinkedIn, or your favorite farming forum! And if you have tips we missed, drop them in the comments below.

Stay safe, stay productive—and keep that auger spinning the right way.