Manitowoc National Crane NBT30H-2, Руководство по обслуживанию

Страница: 16 / 194

1-6
03-20-2019 Control # 613-06
INTRODUCTION NBT30H-2 SERVICE MANUAL
When pressing bearings into a retainer or bore, uniformly
apply pressure to the outer race. If the bearing is pressed on
the shaft, uniformly apply pressure on the inner race.
Preload
Preload is an initial load placed on the bearing at the time of
assembly. Whether a tapered roller bearing should have
preload could depend on any of several conditions: rigidity of
the housings and shaft, bearing spread, speed of operation,
etc.
To determine whether a bearing requires preload or end
clearance, consult the disassembly and assembly
instructions pertaining to that bearing.
Care should be exercised in applying preload. Misapplication
while preloading bearings requiring end clearance can result
in bearing failure.
Sleeve Bearings
Do not install sleeve bearings with a hammer. Use a press
and be sure to apply the pressure directly in line with the
bore. If it is necessary to drive a bearing into place, use a
bearing driver or a bar with a smooth flat end. If a sleeve
bearing has an oil hole, align it with the oil hole in the mating
part.
Gaskets
Be sure the holes in the gaskets correspond with the
passages in the mating parts. If it is necessary to make
gaskets, select material of the proper type and thickness. Be
sure to cut holes in the right places. Blank gaskets can cause
serious damage.
When removed, always install new cylinder head and
manifold gaskets using recommended gasket compound on
head gaskets to allow uniform sealing.
Batteries
Clean batteries by scrubbing them with a solution of baking
soda and water. Rinse with clear water. After cleaning, dry
thoroughly and coat terminals and connections with an anti
corrosion compound or grease.
If the machine is to be stored or not used for an extended
period of time, the batteries should be removed. Store the
batteries in a cool (not subfreezing), dry place, preferably on
wooden shelves. Never store on concrete. A small charge
should be introduced periodically to keep the specific gravity
rating at recommended level.
Jump Starting Hazard
Do not attempt to jump start the crane.
All crane models, particularly those produced since 2000,
have multiple computer systems (crane control, RCL, engine
& transmission control) that are highly susceptible to voltage/
amperage surges in the electrical system.
The batteries should be completely disconnected from the
crane electrical system and charged using a battery charger
of appropriate voltage level or replace the batteries with fully
charged batteries.
Charging the Battery
When charging the batteries, do not turn on the battery
charger until the charging leads have been connected to the
battery(s). Also, if the battery(s) are found to be frozen, do
not attempt to charge them. Remove the battery(s) from the
crane, allow them to thaw, and then charge the battery(s) to
full capacity.
“Slow charging” is preferred to “fast charging”. Fast charging
saves time but risks overheating the battery(s). Slow
charging at six (6) amps or less develops less heat inside the
battery and breaks up the sulfate on the battery plates more
efficiently to bring the battery up to full charge. The use of a
“smart charger” that automatically adjusts the charging
amperage rate should be used.
CAUTION
It is strongly recommended that the batteries not be
“jumped” with a different vehicle, portable power pack,
etc. The surge of power from these sources can
irreparably damage the various electronic controls and
computer systems. Jump starting the crane batteries
with a different vehicle while the engine is running can
damage the donor vehicle electronics as well if done
improperly.