Generac — Test 40 - Test Oil Temperature Switch
Testing & diagnosis
From a Generac service manual covering: 4700, QuietPact 40, QuietPact 40 LP, QuietPact 40G, QuietPact 40LP. Check it applies to your exact model before use.
Applies to: Generac 4700, Generac QuietPact 40, Generac QuietPact 40 LP, Generac QuietPact 40G, Generac GH-220 engine
Procedure
- Remove Wire No. 85 from switch terminal and start generator to isolate the fault
- Remove switch and place sensing tip into oil with a thermometer
- Connect VOM test leads across switch terminals; should read infinity
- Heat oil; at approximately 305°F (151°C) switch contacts should close and meter should read continuity
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Switch closes at approximately 305°F (151°C)
Full service-parts list: Generac 4700 →, Generac QuietPact 40 →, Generac QuietPact 40 LP →, Generac QuietPact 40G →
Source: Generac service 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.