GENERATOR PREPARATION
Using the Generator for the First Time
The following section describes steps necessary to prepare the generator for use. If after
reading this section, you are unsure about how to perform any of the steps please call (800)
232-1195 M-F 8-5 CST
for customer service. Failure to perform these steps properly can
damage the generator or shorten its life.
WEN 4050 generator was completely assembled at the factory. If anything is damaged, contact
WEN customer service at 1 800 232 1195 M-F 8-5 CST.
Step 1 - Fill Oil
The generator is shipped without oil. User must add
the proper amount of oil before operating the
generator for the first time. The oil capacity of the
engine crankcase is 20 fluid oz.
Select good quality detergent oil bearing the
American Petroleum Institute (API) service
classifications SJ, SL, or SM. (Synthetic oils may be
used.) Use the SAE viscosity grade of oil from the
following chart that matches the starting temperature
anticipated before the next oil changes.
To fill oil to the crankcase, follow these steps:
1. Make sure the generator is on a level surface.
Tilting the generator to assist in filling will cause oil to flow into engine areas and will
cause damage. Keep generator level!
2. Remove the oil filler/dipstick cap from the engine as shown in figure 1.
3. Using a funnel, add the appropriate type and amount of oil into the crankcase. The
crankcase is full when the oil level has reached the second thread from the lip of the
opening (see figure 2).
4. Check for oil leaks. Reinstall oil filler cap before starting engine.
Figure 1- Unscrewing the oil cap Figure 2- filling oil
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