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What to Check And How To Check
Tire Pressure
Proper air pressure for your tires is printed on the
sidewall. Check pressure while tires are cold. Do not
raise or lower pressure to meet load. Pressure other
than recommended pressure will lead to excessive tire
wear or tire failure. Balancing recommended.
Wheels
Check wheels for hole elongation or "out of round". This
condition can be caused by lug nuts not being tight or
being too tight. Trailer wheels can be damaged by
chuck holes or curb jumping. You may not be aware of
the road shock to the wheels without periodic checks.
Replace any wheel that is bent. Replace any wheel if
you see elongation of the bolt holes.
Wheel Lugs
Wheel lug nuts must be tightened with a torque wrench.
Refer to the chart below for proper torque.
1. Start all bolts or nuts by hand to
prevent cross threading.
2. Tighten bolts or nuts following
sequence at right.
3. The tightening of the fasteners
should be done in stages.
Following the recommended sequence, tighten
fasteners per wheel torque chart below.
4. Wheel nuts/bolts should be torqued before first
road use and after each wheel removal. Check and
re-torque after the first 10 miles, 25 miles and
again at 50 miles. Check periodically thereafter.
Wheel Torque Requirements
TORQUE SEQUENCE
WHEEL
SIZE
1st Stage
16"
20 - 25
Ball Coupler Hitches
Coupler assembly includes a latch lever and latch lever
safety pin or hitch pin. Be sure the latch lever is locked
and the pin properly secured before moving your trailer.
The pin can be engaged fully only if ball is properly
seated in the coupler.
14
1
4
2
5
2nd Stage
3rd Stage
50 - 60
80-90
Karcher HDS 3.5/40 GE MT Operator's Manual 9.807-942.0 - C
Tires
Before mounting tires onto wheels make certain that
the rim size and contour is approved for the tire as
shown in the Tire and Rim Association Yearbook or the
tire manufacturer's catalog. Also make sure the tire will
carry the rated load. If the load is not equal on all tires
due to trailer weight distribution, use the tire rated for
the heaviest wheel position.
NOTE: The capacity rating molded into the
sidewall of the tire is not always the proper rating
for the tire if used in a trailer application. Use the
following guideline:
1. LT and ST tires: use the capacity rating molded into
the tire.
2. Passenger Car Tires: Use the capacity rating
molded into the tire sidewall divided by 1.10.
Use tire mounting procedures as outlined by the
Rubber Manufacturer's Association or the tire manufac-
turers.
NOTE: Tire wear should be checked frequently
because once a wear pattern becomes firmly
3
established in a tire it is difficult to stop, even if
the underlying cause is corrected.
WEAR PATTERN
Center
Wear
Edge
Wear
Side Wear
Toe Wear
Cupping
Flat
Spots
CAUSE
ACTION
Adjust pressure
Over
to particular
Inflation
load per tire
catalog.
Adjust pressure
Under
to particular
Inflation
load per tire
catalog.
Make sure load
Loss of
doesn't exceed
camber or
axle rating.
overloading
Align at align-
ment shop.
Incorrect
Align at align-
toe-in
ment shop.
Check bearing
Out of
adjustment and
balance
balance tires.
Avoid sudden
Wheel
stops when
lockup & tire
possible and
skidding
adjust brakes.
ACTION
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