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|  MIL-T-9720F(USAF)
The lift truck shall be subjected to humidity tests
4.6.3.3 Humidity test.
in accordance with MIL-STD-810, method 507.1, procedure II
After completion
of the test, the lift truck shall be inspected.
Some rust and corrosion is to
be expected as a result of this test.
The pass/fail criteria is as follows:
The lift truck shall be operated for 30 minutes at step 8 of proce-
a.
dure II by cycling each motion as permitted by the physical size of
the test chamber.
There shall be no evidence of abnormal operation.
b.
The vehicle must be capable of completing the remainder of the first
article tests without incurring a failure which is directly connected
with such rust and/or corrosion.
There must not be patterns of rust and/or corrosion which may indicate
c.
that the contractor's manufacturing procedures are inadequate.
E x a m p l e s of s u c h p a t t e r n s a r e :
(1) General and gross flaking or peeling of paint.
(2)
General and gross corrosion of hardware such as nuts, bolts, etc.
(3) Extensive corroision of an individual functional component such
as a pump, motor or valve which prevents the component from
o p e r a t i n g o r can reasonably be expected to prevent normal
operation in the near future.
The lift truck
4 . 6 . 3 . 4 S a n d a n d d u s t t e s t , method 510.1, procedure I.
shall be operated for 30 minutes by cycling each motion as permitted by the
physical size of the test chamber at step 5 of procedure I.
The lift truck shall be subjected to a
4.6.4 Structural overload tests.
static load test. The forward frames shall be blocked to prevent transmission
of the load through the tires.
The rear of the lift truck shall be chained or
The lifting arm
otherwise restrained to allow application of the full load.
A 7500 pound
will be set so that the cradle is 30-50 inches of the ground.
Evi-
load shall be placed on the cradle and held in position for 3 minutes.
dence of yield in any of the components which could in any manner prevent the
lift truck from meeting operational requirements during service life shall be
reason to consider that the lift truck has failed this test.
The lift truck shall be operated at maximum
4.6.5 Engine loading test.
Simultaneous operation of lift
forward speed on a level hard surface road.
arms and steering shall not cause the engine to stall.
4 . 6 . 6 T o w i n g t e s t . With the engine off and the rotary by-pass valve in
t h e o p e n p o s i t i o n , t h e u n l o a d e d l i f t t r u c k s h a l l b e p u s h e d 3 0 feet by two men
The truck shall then be loaded
without undue resistance of t h e d r i v e t r a i n
Towing shall have no adverse effect on the hydrostatic
a n d towed .3 miles.
d r i v e system as evidenced by examination and successful completion of the
remaining tests.
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