MIL-C-0052980C(ME)
3.26.4
Engine pulley.
When a V-belt drive is used, "the engine
drive pulley shall be provided with an inner hub which clamps to the
shaft by moving axially along a taper in the outer hub.
The
mechanical clamping shall be accomplished by the use of a screw
member or members for mounting and removal of the pulley.
The exhaust manifold, muffler, and spark
3.26.5 Exhaust systems
arrestor shall be positioned so that exhaust gases shall be directed
away from the operator's position, fuel tank, compressor air intake,
and any other component or function that may be adversely affected
by exhaust gases or heat and shall remain at least 4 inches away
The exhaust system
from the fuel tank under all belt adjustments.
shall be protected against the entry of rain and shall include
drainage provisions to prevent accumulation of water and condensed
vapors. When a commercial engine is used, the back pressure of the
exhaust system, including the muffler and the spark arrestor, shall
not exceed the maximum recommended by the manufacturer at maximum
horsepower output and speed under all operating conditions specified
When the Government furnishes the 1-1/2 hp engine then the
herein.
muffler will be furnished by the Government as part of the engine.
When the Government furnishes the 6 hp engine the contractor shall
provide two mufflers.
For Government-furnished engines the back
pressure of the exhaust system, including mufflers, shall not exceed
8 inches of water at maximum horsepower output and speed under all
operating conditions specified herein.
3.26.6 Power takeoff
When a V-belt drive is used for the size
15 cfm and 25 cfm compressors, the contractor shall furnish and
install a power takeoff on the engine for driving the compressor
unit.
The power takeoff shall consist essentially of a 4-bolt
flange bolted to the engine flywheel and a stub shaft or other
device on which the drive pulley or clutch shall be mounted.
When a
direct drive is used, a flexible coupling shall be installed between
the engine and compressor units.
The nominal rating of the power
takeoff shall be not less than 150 percent of the rated horsepower
of the engine.
3.26.7 Clutch. When specified for the 15 and 25 cfm size
compressors (see 6.2) , the engine shall be equipped with a clutch.
The clutch shall be accessible for adjustment, replacement of parts,
and lubrication (unless bearings with sealed-in lubrication are
used) .
Adjustment of the clutch shall not require special tools.
The nominal rating of the clutch shall be not less than 150 percent
of the maximum engine torque.
The clutch operating lever shall be
accessible to the operator and labeled as to function and shall be
provided with double-ended arrows showing the direction of operation
and labeled at each end to indicate the functional result (engage
and disengage) in accordance with MIL-STD-1472, 5.4.3.2.1.3 (see
3.7.2).
3.26.8 Pressure regulation.
The compressor shall have an
adjustable, pressure actuated mechanical control of the head
unloading type. The control shall be adjusted to stop compression
21
For Parts Inquires submit RFQ to Parts Hangar, Inc.
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business