Deere柴油發動機大修后怎么樣燃油系統排放空氣約翰迪爾6081發動機皮帶張緊輪，

為約翰迪爾雙軌燃油系統放氣

無論何時打開燃油系統進行維修（管路斷開或濾清器拆下），都必須排出系統中的空氣。

1、打開排水閥（A），排出清水分離器沉淀杯（C）中的水和污染物，然后操作手動底漆（B），直到沉淀杯中沒有水和碎屑。

2、松開燃油細濾器（最終）出口管路（a）或取下蓋子并打開空氣凈化閥（D）（如有配備）。

3、在約翰迪爾粗濾器上泵送手動底漆（B），直到連接處流出穩定的燃油流（無氣泡）。

繼續泵送手動底漆，同時將出口管路連接擰緊至24 N•m（18 lb ft）。不要過度擰緊。

5、起動發動機并在高怠速下運轉3-5分鐘。

注意：如果更換了兩個濾清器，手動注油將排出細濾器中的空氣，然后排出干凈的燃油，然后排出粗濾器中的空氣。如果未能從兩個濾清器中排出空氣，將導致約翰迪爾發動機因系統中截留的空氣而熄火

排水分離器

Bleed Dual Rail Fuel System
Whenever the fuel system has been opened up for service (lines disconnected or filters removed), it will be necessary to bleed air from the system.
1. Drain water and contaminants from clear water separator sediment bowl (C) by opening drain valve (A), then operate hand primer (B) until bowl is clear of water and debris.
2. Loosen secondary (final) fuel filter outlet line (a) or remove cap and open air purge valve (D), (if equipped).
3. Pump hand primer (B) on primary filter until a steady flow of fuel (without bubbles) comes out of  connection.
4. Continue pumping hand primer and simultaneously tighten outlet line connection to 24 N•m (18 lb-ft). DO NOT overtighten.
5. Start engine and run at high idle for 3–5  minutes.
NOTE: If both filters were replaced, hand priming will purge air form the secondary filter followed by clean fuel, followed by air from the primary filter. Failure to bleed air from both filters will cause the engine to die due to air trapped in the  system
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Check Single Rail Fuel Supply Pressure
1. Connect a 0-1000 kPa (0-150 psi) gauge to the Diagnostic Quick-connect on the air purge valve after removing the dust cap and cleaning the
quick-disconnect.
2. Open bleed valve
3. Start/crank engine. Fuel transfer pump should maintain minimum pressure shown in specification.
Specification Checking Fuel Supply Pressure
Fuel Transfer Pump Pressure—
Cranking (Minimum 200 RPM)....................  135–175 kPa (1.35–1.75 bar) A—Fuel Supply Pressure Quick Connect Port
(20–25 psi)
Normal (Idle)...........................................  410–555 kPa (4.1–5.5 bar) (60–
80 psi)
Rated Speed ..........................................  480–620 kPa (4.8–6.2 bar) (70–
90 psi)