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Contamination levels for hydraulic system The particulate |
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|  MIL-T-52843C
Each cylinder shall have any exclusion device to prevent foreign
material and fluids from entering around the piston rod and damaging
the seal and other cylinder components. All hydraulic system and
steering cylinders shall perform as specified herein without buckling
or bending. Each piston shall have a bearing surface concentric with
piston to carry the piston side loads against the cylinder walls. The
bearing surface shall be of material that will not scar, score, or
gall the inside surface of the cylinder. All cylinder rods shall be
hard chrome plated. All cylinders shall withstand a pressure that is
equal to 1.5 times the system relief valve setting without evidence
of rupture, permanent deformation, damage, internal or external
leakage.
3.12.8 Contamination levels for hydraulic system The particulate
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matter in hydraulic fluid removed from the system directly upstream
of the filter, shall not exceed the ISO code level of 19/16 in
accordance with SAE J1165 after completion of assembly of the truck
when tested as specified in 4.6.2.21.3.
3.12.9 External leakage. After completing tests specified in
4.6.2, the degree of external hydraulic system leakage shall not
exceed a class 4, for dust-free conditions and a class 4D for dusty
conditions of SAE J1176. External hydraulic system leakage shall not
exceed a class 3 for all production trucks examined under table III.
3.13 Lift mechanism. A lift mechanism (lift arms and fork carrier)
shall be provided. The lift arms shall be pivoted from a location
clear of the operator's position to provide the vertical lift without
interference to the operator's movement necessary to operate the
forklift, or to ingress or egress from the operator's seat in any
lift position. The movement of the boom and fork carriage shall be
controlled by means of double-acting hydraulic cylinders. The fork
tilt angle shall be automatically maintained to be approximately the
same throughout the lift cycle, allowing not more than 30 degree
tiltback when the forks are lifted from a level position on the
ground to the highest position with no tilt forward of horizontal
permitted throughout the lift cycle. Tilt control valve or other
positive means shall be provided to prevent cavitation in the tilt
cylinder(s) when tilting rated load to full forward tilt position at
engine low idle speed at a minimum 120 F oil temperature, when the
tilt valve is wide open and cracked open. Tilt speed from maximum
forward tilt to maximum rearward tilt or from maximum rearward tilt
to maximum forward tilt shall be not less than 0.8 degree/second. The
operator shall be able to see the tip of at least one fork at any
lift height without leaving his seat when there is no load on the
forks. Lift arm safety device(s) shall be furnished in accordance
with SAE J38.
3.13.1 Load backrest extension. A load backrest extension shall be
provided when specified at 33 inches 3 inches high. Load backrest
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