What To Check And How To Check; Tire Pressure; Wheels; Wheel Lugs - Kärcher TRAILER 3500E HDS 4.7/35 Operator's Manual

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
Wheel Size
1st Stage
15" 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.
1
4
2 5
Torque Sequence
2nd Stage 3rd Stage
50-60 80-90

What to Check and How to Check

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
3
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.
Tire wear should be checked frequently because once
a wear pattern becomes firmly 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
alignment shop.
Incorrect Align at
toe-in alignment shop.
Check bearing
Out of
adjustment and
balance
balance tires.
Avoid sudden
Wheel
stops when
lockup & tire
possible and
skidding
adjust brakes.
ACTION
15