11) more frequently, will assure full flow of air for
d. Parking. When possible, lay boards on snow
and drive crawlers up on them, then use compressed air
to blow away all snow accumulations from gears;
chains; sprockets; cable drums; sheaves of bucket, hook
turbocharged engine operates best when operating at
block or boom.
altitude specified on warning plate installed on valve
cover. The highest altitude at which the engine may be
safely operated, without resetting, is listed on this plate.
2-20. Operation in Mud or Deep Water
The engine must be reset for higher altitudes. It may be
operated at a lower altitude without danger of engine
(1) When operating in mud, or water, check
damage, but at less than maximum performance.
footing of crane-shovel frequently to avoid tipping.
(2) When fording a body of water be careful
2-22. Operation Below Sea Level
of hidden boulders or deep holes. Use dipper or
a. With Model 687C-18-ES Engine. This engine
weighted hook block to feel the way across, stopping
will operate satisfactorily at altitudes below sea level
crane travel to swing from side-to-side to detect
without special adjustment.
boulders. Lower dipper or hook to measure depth of
b. With Model D33STA Engine. This turbocharged
water and avoid dangerous holes.
engine will operate at altitudes below sea level without
danger of damage to engine but with reduced efficiency.
immediately after washing or fording.
Long periods of operation at low altitudes should not be
operating mechanism thoroughly lubricated (LO 5-3810-
attempted without reporting details to proper authority,
so that required adjustments may be accomplished.
2-21. Operation at High Altitude
a. With Model 687C-1 8-ES Engine. The blowers
on this engine operate satisfactorily at higher altitudes
without special attention. Service of air cleaner (para 3-
Section VI. OPERATION OF AUXILIARY MATERIEL USED IN
CONJUNCTION WITH CRANE-SHOVEL
(2) Replace cylinder that has been used, or
This section furnishes information on operation of
that does not weigh in accordance with marking on
auxiliary materiel used on, or with the craneshovel.
Cold weather starting aids, fire extinguisher, heaters,
trouble light, and front end attachments are covered in
2-25. Cold Weather Starting Aids
a. General. Units with engines model 687CES-18,
and some units with engine model D333TA installed, are
2-24. Fire Extinguisher (Dry Chemical Type)
equipped with pressure primer discharger (fig. 2-24) for
The dry chemical type fire
use in cold weather starting. Model D333TA engines
extinguisher is suitable for use on all types of fire, and is
also have glow plugs installed, and in this instance both
effective in areas where ambient temperature is -25
glow plugs and propane injection is used for cold
When winterized, (pressurized with
nitrogen) the fire extinguisher may be used in
temperatures below - 25 . This extinguisher is a 2 1/2
b. Cold Weather Starting Operation.
pound, stored pressure, lever-operated fire extinguisher.
(1) Operating the pressure primer discharger.
proceed as follows:
(1) Remove fire extinguisher from its
(a) Move engine throttle control lever
mounting bracket on inside of cab, at right of operator's
(fig. 2-24) to half throttle position.
(c) Press on operating-lever which
(2) Lift handle; press lever, and direct
allows gas pressure in cylinder to force propane into
(1) Inspect for broken seal.