Constructed utilizing high-grade G25 Cast Iron, providing exceptional structural rigidity and an enhanced casing thickness to absorb the relentless rotational torque and violent shock loads caused by striking massive rocks and roots.

Features a standard 1-3/8" 6-spline input shaft and a universally compatible 2-inch round smooth output shaft, ensuring flawless integration with the vast majority of standard and heavy-duty agricultural auger bits.

Engineered as a high-performance tractor auger transmission, utilizing a 3:1 ratio to convert a 540 RPM input into a deliberate, extreme-torque 180 RPM output, ideal for clearing compacted dirt effectively without throwing debris dangerously far.

Designed with a 1.3-liter internal extreme pressure gear oil capacity, guaranteeing continuous splash lubrication to the heavy-duty tapered roller bearings during long, grueling days of fencing or orchard planting.

Built with an integrated shear pin protection design on the output shaft, safely decoupling the auger from the gear train when striking immovable underground obstacles, protecting both the heavy-duty gearbox and the tractor PTO from catastrophic failure.

Step by Step Installation Procedures

To guarantee the absolute reliability, safety, and warranty validity of your new EP-D-32 Post Hole Digger Gearbox, rigorous adherence to the following professional installation protocols is strictly mandatory for all farm maintenance personnel.

Preparation and Boom Mounting

Begin by carefully sliding the top mounting ears of the EP-D-32 gearbox into the U-bracket on your tractor's implement boom. Insert the heavy-duty pivot pin through the boom and the gearbox ears, securing it with the appropriate lynchpin or heavy cotter pin. Ensure the gearbox swings freely back and forth, allowing it to hang perfectly plumb due to gravity.

Auger Bit Connection

Raise the boom slightly. Slide the collar of your 2-inch auger bit up onto the smooth 2-inch output shaft of the gearbox. Align the through-holes and insert the correctly sized, soft (Grade 2) shear bolt through the collar and shaft. Secure it with a lock washer and nut.

Tractor PTO Connection

With the tractor engine completely turned OFF and the keys removed, slide the 1-3/8" 6-spline PTO driveline onto the gearbox input shaft. Depress the quick-release locking pin on the driveline yoke and push until the locking pin snaps firmly into the retaining groove on the gearbox shaft. Connect the other end of the heavy-duty PTO shaft to the tractor.

Driveline Angle Verification

Slowly raise and lower the 3-point hitch through its full range of motion. Ensure that the PTO driveline does not bind, bottom out (compress completely), or separate at any point during the arc of travel.

Lubrication Commissioning Procedures

The EP-D-32 is shipped completely dry without any fluid to comply with shipping regulations. Operating this massive gearbox for even one minute without gear oil will cause catastrophic friction failure. Remove the top breather/fill plug and carefully fill the gearbox with exactly 1.3 liters of premium SAE 85W-140 or SAE 90 EP (Extreme Pressure) gear oil. Check the fluid level using the designated side level plug.

Preventative Maintenance and Lubrication

The operational longevity and mechanical reliability of the EP-D-32 PTO driven auger gearbox is directly proportional to the quality and strict frequency of the preventative maintenance it receives in the dusty, punishing agricultural environment.

Initial Break-In Oil Replacement

During the first 50 hours of active digging operation, the newly machined bevel gear teeth undergo a natural microscopic polishing process. This safely sheds microscopic steel particles directly into the gear oil. You must drain and entirely replace the initial 1.3 liters of gear oil after exactly 50 hours of use. Perform this crucial oil change while the oil is warm to flush all impurities effectively.

Routine Scheduled Lubrication

Following the initial break-in period, the gear oil must be replaced every 500 operating hours, or at least once annually before the primary spring fencing or planting season. Continuous exposure to outdoor temperatures and extreme workloads degrades the extreme pressure chemical additives in the oil, necessitating strict replacement intervals.

Shear Pin and Boom Maintenance

Regularly inspect the shear pin on the output shaft. If the pin becomes visibly bent or heavily scored, replace it immediately before it fails mid-hole. Furthermore, routinely grease the universal joints (crosses) on your PTO driveline and the pivot pin where the gearbox mounts to the boom to ensure the heavy gearbox always hangs perfectly plumb without binding.

Advanced Troubleshooting Guide

Auger Fails to Rotate (Loss of Drive)

If the tractor PTO is spinning but the auger bit remains completely motionless, immediately turn off the tractor and check the output shaft shear pin. It is highly likely that the soft Grade 2 shear pin has snapped (doing its job perfectly) because the auger hit a massive rock or root. Simply align the holes and replace the shear pin. If the shear pin is intact but the output shaft is not turning, the internal bevel gears or the input shaft roll pin have sheared due to an extreme, sudden overload.

Housing Overheating Diagnosis

The heavy cast iron housing should operate warm to the touch. If the unit is severely overheating or emitting smoke, immediately stop operations. Dangerously low gear oil causes extreme metal-on-metal friction. Ensure the gearbox is filled to the side check-plug with 80W-90 EP oil. Overheating can also occur if you are continuously forcing the auger down into extremely hard, dry clay rather than letting the auger cutting teeth bite at their own natural pace.

Severe Vibration or Wobbly Digging

If the gearbox and boom shake violently while digging, immediately check the condition of the massive auger bit. A bent auger flighting, a warped center shaft, or a missing cutting tooth will cause severe rotational imbalance. Additionally, verify that the PTO driveline is not bent and that the U-joints are in excellent condition. Operating with bent components will rapidly destroy the gearbox's input and output bearings.

Oil Seal Leakage

If you notice gear oil actively dripping from the bottom output shaft, replace the lower oil seal immediately. This is frequently caused by tall field grass, wire, or old fencing twine wrapping tightly around the output shaft above the auger bit. This debris acts as a rotating knife, slicing directly through the rubber oil seal and causing total fluid loss. Keep the output shaft entirely clear of wrapped debris.