Gearbox for Boom Sprayer

Compatible models: Model 7415, Mk-II, Type 72K. Direct bolt-on replacement — no modifications required.

Compatible models: Mk-I, Series 555, 661T. Direct bolt-on replacement — no modifications required.

Compatible models: Type 49E, G2.2, 235T. Direct bolt-on replacement — no modifications required.

Compatible models: 496T, Mk-II, Type 54A. Direct bolt-on replacement — no modifications required.

Compatible models: G9.4, Mk-V, C-182. Direct bolt-on replacement — no modifications required.

Compatible models: Series 876, Mk-V, 680S. Direct bolt-on replacement — no modifications required.

Compatible models: Type 54G, Model 3202, Series 888. Direct bolt-on replacement — no modifications required.

Disconnect the PTO driveline from the gearbox input shaft. Support the gearbox weight with a floor jack or overhead hoist (typical weight: 15-70 kg depending on model). Remove all mounting bolts in a criss-cross pattern to relieve clamping stress evenly. Carefully lower the old gearbox and set it aside.

Clean the mounting flange on the boom sprayer frame with a wire brush and solvent, removing all old sealant, rust, and debris. Inspect the mounting surface for cracks, stripped threads, or warping. Chase any damaged bolt threads with a tap. Apply a thin film of anti-seize compound to the mounting face if specified.

After the first 10 hours of field operation, re-torque all mounting bolts to specification. Check the oil level and top up if necessary. Inspect all seals for any signs of weeping. Verify the driveline guard is properly reinstalled. Record the installation date and hour-meter reading for future maintenance scheduling.

Remove the fill plug and slowly add the recommended gear oil until it reaches the level indicator. Use the lubricant grade specified in the gearbox documentation (typically SAE 80W-90 GL-5 or equivalent). Replace the fill plug and hand-tighten, then snug with a wrench. Verify the breather cap is clean and unobstructed.

Start the tractor and engage the PTO at low RPM (approximately 300 RPM). Listen carefully for any grinding, whining, knocking, or clicking sounds. Run at low speed for 15-20 minutes, monitoring the gearbox housing temperature by hand (carefully). Check for oil leaks at all seals and the mounting interface. Gradually increase to full operating speed.

Park the tractor on firm, level ground. Engage the parking brake and place wheel chocks. Turn off the engine and remove the key. Disconnect the PTO shaft from the boom sprayer. Allow all components to cool completely before touching. Wear appropriate PPE including gloves and safety glasses.

Locate the drain plug on the existing gearbox and position a catch container underneath. Remove the drain plug and allow all oil to drain completely — inspect the oil for metal particles or discolouration that may indicate internal wear. Record the old gearbox model number, mounting bolt size, and shaft dimensions for reference.

Probable Cause: Insufficient oil volume or degraded lubricant

Recommended Action: Check oil level and grade against the specification. Clean all debris from the housing exterior — especially the cooling fins. If the boom sprayer is being operated at or above the gearbox’s rated power, reduce forward speed or PTO load. Consider upgrading to synthetic gear oil for improved thermal performance.

Probable Cause: Worn lip seals or damaged seal bore

Recommended Action: First, check and correct the oil level — overfilling is a surprisingly common cause of seal leaks. Clean or replace the breather cap. If oil level is correct and breather is clear, the seal has worn and should be replaced using our seal kit.

Probable Cause: Shear bolt or overload protection has activated

Recommended Action: Check the overload protection device first — this is the most likely cause if the gearbox was recently subjected to a sudden overload. Replace the shear bolt or reset the slip clutch per the manual. If overload protection is intact, the gearbox has internal damage and requires professional service.

Probable Cause: Misaligned PTO driveline exceeding joint angle limits

Recommended Action: First check all mounting bolt torques — vibration frequently loosens fasteners, which then amplifies the vibration. Next, inspect the PTO driveline U-joints for wear or binding. Verify driveline angles are within specification. Finally, check the output coupling to the pump drive for wear or damage.

Probable Cause: Misaligned splines due to different PTO standard

Recommended Action: Clean the input shaft splines with a wire brush and apply a light coat of anti-seize. Slowly rotate the PTO shaft while pushing to align the splines. If the splines will not engage, verify the spline count matches your PTO standard — 6-spline for 540 RPM, 21-spline for 1000 RPM.

Our gearboxes are mechanical components and contain no substances that would affect organic certification. However, the choice of lubricant should be considered — we can recommend food-grade and biodegradable gear oils that are compatible with organic farming standards in Australia and internationally.

Every gearbox ships with: installation manual with torque specifications, lubrication and maintenance schedule, parts diagram with individual part numbers, warranty registration card, and a quality inspection certificate with the unit’s serial number and test results.

Each gearbox is drained of shipping oil, wrapped in VCI (Vapor Corrosion Inhibitor) film, and crated in a sturdy plywood box rated for international freight. This packaging protects against moisture, impact, and corrosion during transit — even for shipments to remote Australian properties via road freight.

We accept bank transfer, credit card, and purchase orders from established accounts. For large orders, we offer 30-day payment terms subject to credit approval. Orders can be placed through our website, by email, or by phone. Pro-forma invoices are available for pre-payment arrangements.

Absolutely. We manufacture gearboxes with keyed, splined, flanged, hex, and hollow-bore output shaft configurations. If your boom sprayer requires a non-standard output size, spline count, or connection type, our engineering team will design and machine it to your exact specifications at no additional lead time for common modifications.

If you provide your equipment details before ordering and we confirm compatibility, fitment is guaranteed. In the rare event of a compatibility issue, we offer a no-questions-asked exchange or refund on unused gearboxes within 30 days of delivery. Our goal is to match you with the correct gearbox on the first order.

The gearbox is specifically designed for the dynamic and impact loading characteristic of field spraying applications. Case-hardened alloy steel gears absorb repetitive shocks, while the optional overload protection (shear bolt or slip clutch) safeguards against catastrophic overload events. The bearing selection and housing rigidity are both matched to boom sprayer load profiles.

Our 24-month comprehensive warranty covers all defects in materials and workmanship, including bearings, gears, seals, and housing. It applies from the date of purchase and is backed by our ISO-certified quality management system. Extended warranty programs are available for bulk and fleet orders.

Our gearbox matches or exceeds OEM specifications across all measurable parameters. Key improvements include upgraded bearing classes, superior seal materials, enhanced heat dissipation, and the option for custom gear ratios that OEM catalogues do not offer. The result is a drop-in replacement that typically outlasts the original.

Yes — every purchase includes access to our engineering support team for installation guidance, troubleshooting, maintenance advice, and parts ordering. Support is available via phone, email, and our online contact form. There is no charge for technical support during or after the warranty period.

Our gearboxes meet design requirements for agricultural machinery components, including rotating part guarding interfaces.

Gearbox housings safely contain internal operating pressures in compliance with applicable standards.

Our products comply with Australian machinery safeguarding standards applicable to agricultural boom sprayer equipment.

mirrors national standards for agricultural machinery including boom sprayer equipment.

mandates operator training for all PTO-driven boom sprayer equipment.

includes obligations for remote farm operations involving field spraying equipment.