Northern Lights — Pressure Testing the Cooling System
Maintenance
From a Northern Lights owner's manual covering: NL445D, NL445D1, NL445T1, NL445T2, NL668T2. Check it applies to your exact model before use.
Applies to: Northern Lights NL445D1, Northern Lights NL445T1, Northern Lights NL445T2, Northern Lights NL668T2, John Deere 4045D150 / 4045T150 / 4045T250 / 6068T250 engine
Before you start
- Explosive releases of fluids from pressurized cooling systems can cause serious burns. Shut off engine and only remove filler cap when cool enough to touch with bare hands.
Procedure
- Remove the radiator cap and attach it to the D05104ST Tester.
- Pressurize the cap to 70 kPa (0.7 bar)(10 psi); the gauge should hold pressure for 10 seconds.
- If the gauge does not hold pressure, replace the radiator cap; retest the cap turned 180°.
- Allow the engine to cool and carefully remove the radiator cap.
- Fill the radiator with coolant to the normal operating level.
- Connect the gauge and adapter to the radiator filler neck and pressurize the cooling system to 70 kPa (0.7 bar)(10 psi).
- With pressure applied, check all cooling system hose connections, radiator and engine for leaks.
Tools required
- D05104ST Tester Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Test pressure 70 kPa (0.7 bar)(10 psi)
Full service-parts list: Northern Lights NL445D1 →, Northern Lights NL445T1 →, Northern Lights NL445T2 →, Northern Lights NL668T2 →, John Deere 4045D150 / 4045T150 / 4045T250 / 6068T250 engine →
Source: Northern Lights owner's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.