MAINTENANCE CD15 OPERATOR MANUAL
6-4 Published 3-30-2018, CTRL 636-05
becomes entrapped in the hydraulic oil, it may be detectable
in pumps and motor operated components such as the swing
mechanism 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 tank 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
hydraulic tank. Using a positive means to control the
pressure (like a regulator), pressurize the hydraulic
system to 0.138 to 0.276 bar (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 hydraulic tank after completing any
repairs or service. Operate all hydraulic circuits several
times in both directions.
• This action should return any entrapped air to the
hydraulic tank 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 hydraulic
tank. Ensure the boom is first telescoped IN (not OUT) in
the morning. Telescoping OUT may cause air to be
forced back into the 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.
Parts Replacement
Parts found damaged or out of tolerance when maintenance
is being performed should be replaced. Refer to the Grove
Parts Catalog for proper replacement parts.
SPECIAL MAINTENANCE
Delivery Inspection
Fuel Tank
• Fill with correct fuel.
Engine
• Check oil in crankcase
• On diesel engines remove water from fuel filters and
sediment bowl.
Cooling system
• Check coolant level. Fill if level is low.
Hydraulic Tank
• Check oil level. Fill if level is low.
Drive Axles
• Check axle housing lubricant level and wheel hub
lubricant level. Fill if levels are low.
Hoist Gearbox
• Check oil level. Fill if level is low.
Tires
• Check for correct air pressure.
Wire rope cable clamps and connections
CAUTION
Always locate the machine on a firm supporting surface,
extend the outriggers and level the machine and position
the boom over the front to extend the boom at low angles.
Injury or damage to the machine may result if this caution
is not followed.
CAUTION
Do not attempt to loosen fittings in pressurized lines or
while the hydraulic pumps are in operation.
Extreme care must be used when removing any plugs or
restrictions from a hydraulic system suspected to have
entrapped air that may be pressurized. Moderate to minor
injury may result from pressurized air in a hydraulic
system.
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