Maintenance
Owner’s Manual for Stationary Industrial Generators 29
4.9.2.2—Check Coolant Level
● DO NOT remove the radiator pressure cap while the engine is hot. Serious burns from boiling liquid
or steam could result.
● Add coolant only to the expansion tank when the engine is cool (not at operating temperature).
● Ethylene glycol base antifreeze is poisonous. Do not use mouth-to-siphon coolant from the radiator,
recovery bottle, or any container. Wash hands thoroughly after handling. Never store used antifreeze
in an open container because animals are attracted to the smell and the taste of antifreeze even
though it is poisonous.
Do not use any chromate base rust inhibitor with propylene glycol base antifreeze. Using any high silicate anti-
freeze boosters or additives also will cause overheating. The manufacturer also recommends that any soluble
oil inhibitor is NOT USED for this equipment.
Visually check the coolant expansion tank and make sure the coolant level is between the “Cold” and “Hot” level mark-
ings. To add coolant to the system add it to the expansion tank when the engine is cool (not at operating temperature,
not running). Add only a 50/50 mixture of the correct antifreeze and distilled or deionized water to the coolant system.
4.9.2.3—Check/Change Gearbox Oil (If Equipped)
Check monthly, or every 100 hours of operation. Biannually (or every 600 hours), an authorized service technician
should completely drain and refill the gearbox.
Gear oil used is 80W-90. Lucas Heavy Duty Oil Stabilizer should be added as follows by Fluid volume:
• 390 Gearbox - Approximately 32 oz. total. 26 oz. gear oil and 6 oz. Lucas Heavy Duty Oil Stabilizer.
• 520 Gearbox - Approximately 55 oz. total. 44 oz. gear oil and 11 oz. Lucas Heavy Duty Oil Stabilizer.
To Check Gearbox Oil Level:
1. Disable the generator from starting.
2. Remove the oil level check plug. See Figure 4-1.
3. The oil level should be at the bottom edge of the oil level check plug hole.
4. To add oil, remove the oil filler/vent cap, and fill through the vent line.
5. Replace the vent cap and oil level check plug and tighten.
NOTE: Do NOT overfill the gearbox. If too much fluid is added let the excess drain from the level check plug
hole and collect it in a suitable container or with rags.
Figure 4-1. Gearbox Oil Servicing Points
Oil Drain Plug
Oil Filler/Vent Cap
Oil Level
Check Plug
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