Diaphragm pump GMB185 for agricultural tractor sprayer use

Product Overview

Unlike complete sprayers, this product is a standalone diaphragm pump—critical for powering tractor sprayers (e.g., boom sprayers, orchard sprayers) by converting tractor PTO power into consistent fluid pressure. The “Diaphragm Pump” denotes its positive-displacement design (ideal for thick agricultural fluids), “GMB185” references its model (185 series) with key specs (1.8MPa max pressure, 5L/min flow rate), and “Agricultural Tractor Sprayer” confirms its specialized use case. As part of Farmate’s “sprayer components” lineup, this pump addresses the common failure points of standard sprayer pumps: leaks, clogging, and inability to handle thick solutions. Supplied as 1 unit, it includes a PTO adapter, mounting brackets, and a 1-year warranty. Whether you’re replacing a worn pump on your existing tractor sprayer, upgrading to a higher-pressure model, or building a custom sprayer, the GMB185 delivers reliable, high-pressure performance that keeps your agricultural sprayer running efficiently.

Product Features

1.8MPa High-Pressure Diaphragm Design

The GMB185’s core strength is its industrial-grade diaphragm design, which delivers a maximum pressure of 1.8MPa (261 PSI) and a steady flow rate of 5L/min—enough to power large boom sprayers (up to 3m boom width) or high-reach orchard sprayers. Unlike piston pumps that struggle with thick fluids, the diaphragm design handles viscous solutions (liquid manure, concentrated fertilizers, or wettable powders) without clogging—critical for agricultural use where solution consistency varies. The diaphragm is made from nitrile rubber (NBR) —resistant to oil, chemicals, and extreme temperatures (-10°C to 60°C)—ensuring it lasts 2-3 times longer than standard rubber diaphragms. The pump also includes a pressure relief valve that releases excess pressure if levels exceed 2.0MPa, protecting both the pump and your sprayer’s hoses/nozzles from damage.

Tractor PTO Compatibility & Easy Mounting

Designed to connect directly to most tractor PTO systems (540 RPM, the industry standard for agricultural equipment), the GMB185 includes a universal PTO adapter that fits 1-3/8” and 1-1/4” PTO shafts—no custom machining needed. The adapter features a safety clutch that disengages the pump if it encounters a mechanical blockage (e.g., a clogged nozzle), preventing motor or diaphragm damage. The pump also comes with heavy-duty steel mounting brackets that attach to most tractor sprayer frames or tractor rear hitches—installation takes 30-45 minutes with basic hand tools (wrench, screwdriver). The brackets are adjustable, so you can position the pump to align with your sprayer’s fluid lines—minimizing hose bends that cause pressure loss. For technicians building custom sprayers, the pump’s compact size (28cm x 18cm x 22cm) fits in tight spaces without sacrificing performance.

Chemical-Resistant Fluid Path & Low Maintenance

The pump’s entire fluid path—from inlet to outlet—is made from chemical-resistant materials: the housing is aluminum alloy (resists corrosion from fertilizers), the valves are brass (prevents rust), and the inlet/outlet ports are 3/4” NPT (compatible with standard agricultural hoses). This design ensures the pump handles all common agricultural chemicals: herbicides (glyphosate), fungicides (copper sulfate), insecticides (pyrethroids), and organic solutions (neem oil, compost tea)—no risk of chemical degradation. Maintenance is minimal: every 50 hours of use, add 5ml of pump oil to the PTO adapter’s oil reservoir (included) to lubricate moving parts. The diaphragm is replaceable (Farmate sells replacement kits) and takes 15 minutes to install—no need to replace the entire pump if the diaphragm wears out.

Applications

Tractor Sprayer Pump Replacement

Farmers with worn or broken sprayer pumps (e.g., on boom sprayers, orchard sprayers) will find the GMB185 a direct, high-performance replacement. It fits most popular tractor sprayer brands (e.g., John Deere, Kubota, Farmate) and restores sprayer performance—whether your old pump had low pressure, leaks, or clogging issues. The 1.8MPa pressure is ideal for replacing older low-pressure pumps (1.0MPa or less), giving your sprayer more power to penetrate dense crop foliage. For example, replacing a worn 1.0MPa pump with the GMB185 can increase spray reach by 2 meters—critical for tall orchard trees.

Sprayer Performance Upgrades

Farmers looking to upgrade their existing sprayers (e.g., increase pressure, handle thicker solutions) will benefit from the GMB185’s capabilities. If your current pump struggles with concentrated fertilizers or wettable powders, the diaphragm design eliminates clogging. If you need to cover larger areas faster, the 5L/min flow rate increases sprayer efficiency by 30% compared to 3.5L/min pumps. The upgrade is simple: remove your old pump, mount the GMB185 using the included brackets, and connect the PTO adapter—no modifications to your sprayer’s tank or hoses. This is a cost-effective alternative to buying a new sprayer, extending the life of your existing equipment.

Custom Agricultural Sprayer Building

Agricultural equipment technicians or farmers building custom tractor sprayers (e.g., for specialized crops like grapes or hops) will rely on the GMB185 as a core component. Its compact size and adjustable mounting brackets fit custom sprayer frames, and the PTO compatibility works with most tractors. The pump’s ability to handle thick solutions makes it ideal for custom organic sprayers (using compost tea or liquid manure), and the chemical-resistant design ensures it works with specialty pesticides. For example, a custom grape sprayer with a 2m boom can use the GMB185 to deliver targeted, high-pressure spray to grapevines—improving pest control and nutrient absorption.