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Chafer Sentry Trailed Sprayer

Sentry Trailed Sprayer

The Sentry is a high capacity trailed sprayer designed to carry Chafer Machinery’s 30-40m triple fold boom and can accommodate a tanks between 4-6000l. Aimed at the larger grower or contractor the Sentry is fitted with innovative features such as air suspension, axle tracking and prime and purge. These standard features can be enhanced by a wide range of technologically advanced options, including GPS automatic boom section shutoff and Chafer Contour automatic boom leveling.

Safe and smooth field/road travel

The Sentry comes fitted as standard with load compensating air suspension. Three air springs are located between the sprayer chassis and trailed arm giving a smooth and even ride. To further enhance towing safety, the Sentry’s steering axle has been fitted with a hydraulically engaged axle-locking pin that can be operated from the cab. Air brakes can also be fitted as an option to further enhance braking capability.

Increased stability

Stability, especially when spraying on steep ground or even when manoeuvring the sprayer to the field was a key consideration when designing the Sentry. The utilisation of a stepped chassis in conjunction with a square profile stainless steel tank has helped to reduce the centre of gravity by 35% compared to previous models. Baffles inside the tank also reduce the amount liquid moving from side to side further improving stability while at the same time preventing liquid surge when braking sharply on the road. All Chafer trailed sprayers are fitted with a steering axle because of the inherent stability compared to steering drawbar alternatives. 

Tighter tracking

The Sentry’s scalloped wheel arches and adjustable height mudguards allow maximum axle lock on large tyres (320/90 R50 at 72” track width). This gives the advantage of accurate tracking behind the tractor reducing the amount of crop damaged the headland.

Smoother boom ride

A combination of load compensating air suspension on the chassis, lift accumulators for extra vertical suspension as well as gimble suspension for the boom gives a smooth boom ride. Not only do these features these improve the accuracy of chemical application but they also reduce wear and tear on the boom.

Simple operation and maintenance

Two compact command boxes are used to control all functions on the sprayer. The sprayer command box incorporates switches for boom operation, spray section control, pump on/off, boom recirculation and steering. A TeeJet 844 application rate controller allows for precise and rapid reactions to changes in forward speed minimising under or over application of chemical.   

Coupling the sprayer to the tractor could not be simpler. Electrical systems are connected via one multi pin plug. The sprayer pump is hydraulically driven meaning there is no PTO shaft to connect. All hydraulic functions including the pump, boom and steering operate via one spool on the tractor. 

Application accuracy

Application accuracy can be further improved by the use of GPS automatic boom section control. Chafer Contour automatic boom leveling helps to maintain an accurate boom height above the crop and minimised operator fatigue.

Environmental compliance

Features such as spray line prime and purge, an in field wash down lance and enhanced can rinsing nozzles are fitted as standard to help ease compliance with crop assurance and waste recycling regulations.

Sentry Standard Specification

Classis

Box section chassis.
Rigid drawbar with hook pick up
Stowage point for drawbar stand.
Tank access platform with steps.
Hydraulically braked 76” 10 stud axle with parking brake.
12v air compressor.
Auto levelling triple air spring suspension.
Auto tracking axle.
Hydraulically operated axle lock.
Height adjustable mudguards.
Twin storage lockers.
Road traffic lights.
18.4x34 tyres and wheels.

Stainless steel tank

4,000l, 5,000l or 6,000l stainless steel baffled tank with sump isolation valve.
Hinged inspection lid.
500l clean water tank.
Dry tank contents sight gauge.
Triple tank rinse and tank agitation system.
Hand wash water tank.

Boom

18-30m twin fold boom.
30-40m triple fold boom.
Electrohydraulic control of boom lift, tilt and fold.
¾” or 1” stainless steel spray line with 0.5m jet spacing.
Triple outlet anti-drip nozzle bodies.
Spray line prime and purge.
Electric ball valve shutoff.

Plumbing

Hydraulically driven centrifugal pump 650l/min 7 bar.
35l capacity stainless steel venturi chemical hopper.
Rotary suction and pressure control valves.
Pressure filtration system with isolation valve.
In field wash down kit with retractable hose reel.

In cab controls

TeeJet 844 rate controller, pressure based.
Boom, steering and pump command box.

Other Options

Jet flush (Sprays clean water through jets,operated from the cab).
GPS in field guidance system.
GPS controlled automatic boom section shut off.
Chafer Contour automatic boom leveling.
Independent boom tilt.
Airtec/AirJet system.
Air brakes (Air brakes required on tractor).
Air shutoff nozzles.
Dual nozzles on single spray line.
Additional spray line.
Quad or quin nozzles.
Foam marker.

Sentry Tyre Options

Michelin 320/90 R50 150A8
Michelin 420/80 R46 151A8
Michelin 18.4x34 157A8
Michelin 480/80 R46 158A8
Michelin 750/65 R26 166A8
Michelin 800/65 R32 172A8

Dimensions (Based on 5000l, 36m Sentry with 18.4x34 tyres fitted)

Length – m
Width – m
Height – m 
Height to top of tank – m
Tractor requirements – One single acting spool with free flow return (Constant pumping spool)

Chafer Machinery Ltd
1 Cow Lane
Upton
Lincoln
Lincolnshire, UK
DN21 5PB

Tel: 01427 838341

Horstine Farmery is trading division of Chafer Machinery