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This section is intended to provide the user with generic 
trailer service and maintenance information. The service 
and maintenance guidelines referenced in this section refer 
to a wide range of trailers. 

Remember periodic inspection of the trailer will ensure safe 
towing of the generator and will prevent personal injury and 
damage to the equipment.

The definitions below describe some of the major 
components of a typical trailer that would be used with the 
DCA400SSI Whisperwatt™ Generator.

1. 

— Provides an adequate amount of fuel for 

the equipment in use. Fuel cells must be empty when 
transporting equipment.

2. 

— System employed in stopping 

the trailer. Typical braking systems are electric, surge, 
hydraulic, hydraulic-surge and air.

3. 

— Gross Vehicle Weight Rating (GVWR) is 

the maximum number of pounds the trailer can carry, 
including the fuel cell (empty).

4. 

— Measurement is from the ball hitch 

to the rear bumper (refl ector).

5. 

— Measurement is from fender to 

fender

6. 

— Trailer support device with maximum 

pound requirement from the tongue of the trailer.

7. 

— Type of hitch used on the trailer for 

towing.

8. 

— Indicates the diameter of the tire in 

inches (10,12,14, etc.), and the width in millimeters 
(175,185,205, etc.). The tire diameter must match the 
diameter of the tire rim.

9. 

— The tire ply (layers) number is rated in 

letters; 2-ply,4-ply,6-ply, etc.

10. 

— The wheel hub is connected to the 

trailer’s axle. 

11. 

— Tires mounted on a tire rim. The tire rim 

must match the size of the tire.

12. 

— Used to secure the wheel to the wheel 

hub. Always use a torque wrench to tighten down 
the lug nuts. See Table 18 and Figure 62 for lug nut 
tightening and sequence. 

13. 

— Indicates the maximum weight the axle can 

support in pounds, and the diameter of the axle 
expressed in inches. Please note that some trailers 
have a double axle. This will be shown as 2-6000 lbs., 
meaning two axles with a total weight capacity of 6000 
pounds.

14. 

— Protects the trailer chassis from shocks 

transmitted through the wheels. Types of suspension 
used are leaf, Q-fl ex, and air ride.

15. 

— Electrical connectors (looms) are provided 

with the trailer so the brake lights and turn signals can 
be connected to the towing vehicle. 

16. 

— Indicates which units can be employed 

on a particular trailer.