Air Suspension Dump Valve
The air-suspension height switch may be used to aid
in connecting or disconnecting from a trailer. When
the switch is set to LOWER, the air-suspension
dump valve deflates the air springs to lower the rear
of the vehicle. In the normal position, the automatic
ride-control valves operate for normal driving.
NOTICE
Do not operate the vehicle over uneven ground
such as ramps, speed bumps, curbs, etc. with
the air springs deflated. Doing this may lead to
air bag separation from the piston, preventing the
suspension air springs from reinflating.
NOTICE
Never exhaust air from the suspension while
driving. When the air is exhausted, the suspen-
sion will not absorb road shocks, and compo-
nents may be damaged.
Holland Trailer Coupling
General Information
The Holland PH-T-60-AL trailer coupling is designed
for use with trailers having a maximum gross weight
of 10,000 lb. See
Fig. 18.1. It is a rigid-type pintle
hook, used only on tractor applications, and is fas-
tened to the rear closing crossmember of the vehicle.
It is a non-air-adjusted coupling.
Operation
Trailer Hookup
1.
Chock the front and rear tires of the trailer.
2.
Remove the cotter pin, then lift the lock and raise
the latch.
3.
Back up the vehicle, until the drawbar eye is
over the pintle hook.
4.
Lower the trailer, until the drawbar eye rests on
the pintle hook.
5.
Close the latch, then insert the cotter pin.
NOTICE
Always make sure the connect-hanger/support
keeps the trailer air hoses and electrical cables
positioned so that they do not rub on anything.
Rubbing may wear through hoses or cables, re-
sulting in air leaks, or exposed or broken wires,
potentially affecting trailer brake or electrical sys-
tems.
6.
Hook up the trailer electrical and air lines.
7.
Remove the chocks from the trailer’s tires.
Trailer Release
1.
Apply the tractor and trailer parking brakes.
WARNING
Do not use the trailer air supply for parking trail-
ers not equipped with spring parking brakes.
This applies the trailer service brakes only. As air
bleeds from the trailer brake system, brake appli-
cation is lost. This could allow the unattended
vehicle to roll away, possibly resulting in serious
personal injury or death.
2.
Chock the front and rear tires of the trailer.
3.
Disconnect the trailer air and electrical lines.
Plug the air lines to keep out dirt.
4.
Take the weight of the trailer drawbar off the
pintle hook.
5.
Open the latch, by first removing the cotter pin,
then lift up the lock and raise the latch.
6.
Slowly drive the vehicle away from the trailer.
1
2
3
4
01/20/95
f310314a
1. Lock
2. Cotter Pin
3. Latch
4. Pintle Hook
Fig. 18.1, Holland PH-T-60-AL Trailer Coupling
Trailer Couplings
18.1
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