2-4 Published 08-25-09, Control # 077-04
HYDRAULIC SYSTEM RT9130E SERVICE MANUAL
23. Connect the line to port B of the axle lockout valve.
Energize the axle lockout valve. Replenish the reservoir
hydraulic oil level as necessary.
24. Disconnect the return line from the main hoist motor and
fully hoist up the hoist.
25. Connect the return line to the main hoist motor and fully
hoist down the hoist, then hoist up again. Replenish the
reservoir hydraulic oil level as necessary.
26. Repeat Steps 24 and 25 for the auxiliary hoist as
necessary.
27. Disconnect one of the lines from each of the swing
motors and drive the motors in the direction they will go.
28. Connect the lines to the swing motors, then drive the
swing motors in the opposite direction until the boom is
centered and forward. Replenish the reservoir hydraulic
oil level as necessary.
When hydraulic oils are changed, recheck the reservoir
hydraulic oil level after brief system operation and add
hydraulic oil as required. Working reservoir capacity
(capacity to full mark) is 1226 liters (324 U.S. gallons).
Ensure the crane is level and in the travel mode of operation
when the hydraulic system is being filled. The system must
be filled with all cylinders retracted. Fill the reservoir to the
full mark on the reservoir sight gauge. After the reservoir is
filled, operate all circuits and recheck the reservoir sight
gauge. Add hydraulic oil as required.
Removing Air from the Hydraulic System
Air entering the hydraulic oil will normally be removed
automatically by passage of the hydraulic oil over the baffles
in the hydraulic reservoir. If a component has been replaced,
the reservoir level is too low, or a leak develops in the suction
lines to the pumps, air can enter the system. If air becomes
entrapped in the hydraulic oil, it may be detectable in pumps
and motor operated components such as the swing
mechanisms and hoist(s), because it can cause these units
to become noisy during operation. If noisy operation occurs,
first check the level of the hydraulic reservoir and replenish
as necessary. Then inspect for leaks in the suction lines
leading to the pumps.
Minute leaks may be hard to locate. If a leak is not readily
detectable, use the following way to check for it:
Seal all normal openings in the hydraulic system and the
reservoir. Using a positive means to control the pressure
(like a regulator), pressurize the hydraulic system to
13.8 to 27.6 kPa (2 to 4 psi) and inspect all joints and
fittings for evidence of leaks. A soap solution applied to
the fittings and joints may also prove helpful in detecting
minute leaks while the system is pressurized. Remove
the pressure, repair any leaks found, and reopen any
openings (such as a vent) closed for inspection. Refill
the reservoir after completing any repairs or service.
Operate all hydraulic circuits several times in both
directions.
This action should return any entrapped air to the
reservoir where it can be removed from the hydraulic oil
by the baffles.
To remove entrapped air from telescope cylinders, lower
the boom to below horizontal and fully telescope the
boom in and out several times.
If the air is not readily removed, lower the boom to below
horizontal, extend the telescope cylinders as far as
practicable, and allow the boom to remain in this position
overnight. This should allow entrapped air to find its way
to the holding valve so that telescoping the boom IN the
next morning should force the air back to the reservoir.
Ensure the boom is first telescoped IN (not OUT) in the
morning. Telescoping OUT may cause air to be forced
back into a cylinder.
Entrapped air may be removed from cylinders having
wet rods by cycling. On certain cylinders, a plugged port
is provided on the rod end to bleed off entrapped air.
In the event that air entrapment should persist, bleeding
of air by loosening various clamp and screw type fittings
may become necessary.
If the above procedures fail to eliminate air entrapment,
contact your authorized Manitowoc Distributor.
CAUTION
When hydraulic oils are changed or added, ensure that
hydraulic oils of different manufacturers are of the same
specifications. However, discoloration may occur.
DANGER
Locate the machine on a firm supporting surface and
position the boom over the front on outriggers when
extending the boom at low angles.
DANGER
Extreme care must be used when removing any plugs or
restrictions from a hydraulic system suspected to have
entrapped air that may be pressurized.
DANGER
Do not attempt to loosen fittings in pressurized lines or
while the hydraulic pumps are in operation.
To Next Page
Loading...
