Manitowoc 18000, Service Maintenance Manual, Page: 96 / 316

Reference
Only
HYDRAULIC SYSTEM 18000 SERIVCE/MAINTENANCE MANUAL
2-2
Published 12-05-17, Control # 035-23
5. Hydraulic hose assemblies operating in Zone D and E
should expect a degrade of mechanical properties and
long term exposure to these cold temperatures will
negatively impact service life. It is recommended these
hoses be inspected to step 1 above as service life may
be more than 8,000 hours.
HYDRAULIC SYSTEM MAINTENANCE
Safety
Lower or securely block hydraulically operated attachments
and loads before servicing. Do not rely on controls to support
attachments or loads.
Stop engine and relieve hydraulic pressure to zero before
servicing or disconnecting any part of hydraulic system. After
stopping engine, operate controls in both directions to relieve
pressure.
Before servicing hydraulic system, attach warning sign to
engine start controls to warn other personnel not to start
engine.
Do not perform hydraulic system maintenance, adjustment
or repair procedures unless authorized to do so. And then,
make sure all applicable instructions have been read and are
thoroughly understood.
Do not alter specified pressure settings. Higher than
specified pressures can cause structural or hydraulic failure.
Lower than specified pressures can cause loss of control.
Never check for hydraulic leaks with hands. Oil under
pressure can penetrate skin, causing serious injury. Oil
escaping from a small hole can be nearly invisible. Check for
leaks with a piece of cardboard or wood.
Storing and Handling Oil
• Store oil drums in clean, cool, dry location. Avoid
outdoor storage .
• Store oil drums on their side and cover them to prevent
water and dirt from collecting on them.
• When handling drums and transfer containers, use care
to avoid damage which can cause leaks and entry of dirt
or water into oil.
• Before opening a drum, carefully clean top of it. Also
clean faucet or pump to remove oil from drum.
• Only use clean transfer containers.
• Do not take oil from storage until oil is needed. If oil
cannot be used immediately, keep transfer container
tightly covered.
Storing and Handling Parts
• Store new parts (valves, pumps, motors, hoses, tubes)
in a clean, dry indoor location.
• Do not unpack parts or remove port plugs until parts are
needed.
• Once unpacked, carefully inspect each part for damage
that may have occurred during shipping. Remove all
shipping material from ports of parts before installing
them.
• Fittings, hoses, and tubes that are not equipped with
shipping caps or plugs must be carefully cleaned before
they are used. Flush fittings, hoses, and tubes with clean
hydraulic oil. Then seal all openings until use at
assembly.
• Do not use rags to plug openings. Use clean plastic
shipping plugs and caps.
Inspecting System
The damaging effects of dirt, heat, air, and water in the
hydraulic system can only be prevented by regular, thorough
inspection of the system. The frequency of inspection
depends on operating conditions and experience with the
system. However, the more often the system is inspected
and deficiencies corrected, the less likely the system will
malfunction.
A good inspection program will include the following checks:
1. Keep accurate records so future maintenance needs
can be projected.
2. Only use approved hydraulic oil in system (see
Lubrication Guide).
3. Check oil level in tank daily at sight gauge (12,
Figure 2-2 ).
NOTE: Fill tank by removing fill cap (8a, Figure 2-2 ) or by
pumping oil through power fill coupler (8b) with
owner supplied portable pump.
Do not fill tank through breather port or
through top of either filter (9,
Figure 2-2 ).
Hydraulic system could be contaminated from
unfiltered oil.
On crane Serial Number 18001082 and newer,
hydraulic oil level can also be monitored on the
digital display during operation (see
Figure 2-1 ).
HYD TANK FLUID LEVEL 100 %
CURRENT (MAX) WIND SPEED 20 MPH
PUMP DRIVE TEMP 160 DEG
PUMP DRIVE PRESSURE 25 PSI
FIGURE 2-1
0 % = Empty
100 % = Full Cold
110 % = Full Hot