Specifications

PAGE 30 —DA7000 SERIES A.C. GENERATORS— OPERATION AND PARTS MANUAL — REV. #4 (08/07/09)
Adjustable Channel
Your MQ trailer is equipped with an adjustable channel (Fig-
ure 24) that allows the coupler to be raise or lowered to a
desired height. Periodically check the channel bolts for dam-
age or loosening.
Figure 24. Ball-Pintle Coupler Adjustable
Channel
DA7000 SERIES GENERATORS— MAINTENANCE (TRAILER)
 Replace seals that have nicks, tears or wear.
 Lubricate the bearings with a high quality EP-2
automotive wheel bearing grease.
Wheel Hub Adjustment
Every time the wheel hub is removed and the bearings are
reassembled, follow the steps below to check the wheel
bearings for free running and adjust.
 Turn the hub slowly, by hand, while tightening the spindle
nut, until you can no longer turn the hub by hand.
 Loosen the spindle nut just until you are able to turn it
(the spindle nut) by hand. Do not turn the hub while the
spindle nut is loose.
 Install a new cotter pin through the spindle nut and axle.
 Check the adjustments. Both the hub and the spindle
nut should be able to move freely (the spindle nut
motion will be limited by the cotter pin).
Wheel Bearings (Hubs)
Wheeel bearings (Figure 25) must beinspected and lubri-
cated once a year or 12,000 miles toinsure safe operation of
your trailer.
If a trailer wheel bearing is immersed in water, it must be
replaced.
If the generator/trailer has not been used for an extended
amount of time, have the bearings inspected and packed
more frequently, at least every six months and prior to use.
Follow the steps below to disassemble and service the
wheel bearings.
 After removing the dust cap, cotter pin, spindle nut
and spindle washer, remove the hub and drum to
inspect the bearings for wear and damage.
 Replace bearings that have flat spots on rollers, broken
roller cages, rust or pitting. Always replace bearings
and cups in sets. The inner and outer bearings are to be
replaced at the same time.
Figure 25. Wheel Hub Components
WHEEL
HUB
BEARING
CUP
BEARING
CONE
OIL
SEAL
CASTLE
NUT
SPINDLE
WASHER
COTTER
PIN
DUST
CAP
LUG
NUT
If trailer wheels are under water for a long period of time,
wheel bearings may fail. If this is the case, service wheel
bearings immediately.
The possibility exists of the wheels falling off, causing
equipment damage and severe bodily harm even death!
DANGER - Wheel Bearings