Air System Description

CAUTION: Do not direct a heat source of any kind into the fan inlet in an effort to dry fertilizer or other tank commodities. Serious injury and machine damage may occur due to fire or dust explosion.

· Fan Operation:

Fan (A) is driven by a hydraulic motor (B). Fan speed is adjusted and set through use of the tractor's SCV control. A one-way check valve in the return hose prevents the fan motor from turning backward.

The motor case drain line (C) MUST be attached to a low-pressure drain connection on the tractor or motor damage will occur. Drain port back-pressure must be less than 689 kPa (6.89 bar) (100 psi).

To engage fan, pull back SCV control to open return line; then push forward until held by detent.

IMPORTANT: DO NOT place SCV control in neutral while fan is running. Damage to fan motor may occur.

To disengage fan, place SCV control in float. DO NOT place SCV control in neutral while fan is running.

It is NORMAL for fan speed to rise and fall when the cart is in a tight right-hand or left-hand turn. Turning speeds up or slows down the ground drive system, putting more or less product into the air system. Fan speed fluctuates (+/- 50 rpm approx.) in reaction to how much product is in the stream and the resulting back pressure.

A-Fan
B-Hydraulic Motor
C-Motor Case Drain Line

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NOTE: On some tractors, fan speed may surge when warning lights are flashing. This usually happens on tractor with electro-hydraulic controls, but can occur with other control systems. This is not considered a problem as flashing warning lights are normally turned OFF when seeding.

In the side of the fan housing is the fan speed sensor (A). Sensor sends a signal to the cart's electronic controller to display fan speed in revolutions-per-minute (RPM) on the tractor-mounted console.

This signal is also compared to the fan speed setting entered in the cart's electronic controller, which illuminates the fan speed indicator lights as previously described. Fan speed lights are a set-up feature only, not an operational display.

A-Fan Speed Sensor

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· Air System:

Between the fan housing and first meter is the plenum (A). In the plenum the air stream disperses to reach product runs at the first manifold.

SINGLE-SHOOT PLENUM: Standard single-shoot plenum is an open chamber.

DOUBLE-SHOOT PLENUM: Optional double-shoot plenum has an adjustable damper used to divide and balance air flow between the top and bottom runs.

A-Plenum

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At each meter is a primary manifold (A) where air stream picks-up product as it is metered from the tank.

Air ports in the manifold ends provide pressurizing air to the top of the tank through passages in the meter housing and ladder tubes.

Stationary single-shoot manifolds are fixed to bottom of meter housings and can be converted to stationary double-shoot manifolds. Stationary single-shoot and double-shoot manifolds do not utilize seals between plastic components. Some initial air leakage between joints is typical, and will tend to seal due to dust over normal usage.

A-Primary Manifold

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Primary (A) and secondary (B) air hoses are color coded for air run identification.

Clear hose with black spiral is used for single-shoot systems or top runs of a double-shoot system.

Clear hose with green spiral is provided for add-on, lower runs of a double-shoot system.

A-Primary Air Hose
B-Secondary Air Hose

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