Manitowoc 2250 Service Maintenance Manual

Reference Only
Manitowoc Published 07-19-16, Control # 249-01 2-1
2250 SERVICE/MAINTENANCE MANUAL HYDRAULIC AND AIR SYSTEMS
2
SECTION 2
HYDRAULIC AND AIR SYSTEMS
HYDRAULIC SCHEMATICS
Applicable hydraulic and air schematics are attached at the
end of this section.
HYDRAULIC SYSTEM—GENERAL
This section contains maintenance, adjustment, and test
procedures for the hydraulic system and related components
on the Model 2250.
Experienced technicians trained in the operation of this
crane and its hydraulic system shall perform these
procedures. The technicians shall read, understand, and
comply with all instructions and with the display screen
instructions in Section 3 of the Operator Manual. Contact
your Manitowoc Cranes dealer for an explanation of any
procedure not fully understood.
Adjustment, calibration, and test procedures were performed
on the crane before it was shipped from the factory. These
procedures must be performed by field personnel only when
parts are replaced or when instructed by a Manitowoc
Cranes dealer.
CHECKING AND REPLACING HYDRAULIC
HOSES
1. Visually inspect all hydraulic hose assemblies every
month or at 200 hours of service life for the following.
a. Leaks at hose fittings or in the hose
b. Damaged, cut, or abraded cover
c. Exposed reinforcement
d. Kinked, crushed, flattened, or twisted hose
e. Hard, stiff, heat-cracked, or charred hose
f. Blistered, soft, degraded, or loose cover
g. Cracked, damaged, or badly corroded fittings
h. Fitting slippage on hose
i. Other signs of significant deterioration
If any of these conditions exist, evaluate the hose
assemblies for correction or replacement.
2. At the same service interval, visually inspect all other
hydraulic components and valves for the following.
a. Leaking ports
b. Leaking valve sections or manifolds and valves
installed into cylinders or onto motors
c. Damaged or missing hose clamps, guards, or
shields
d. Excessive dirt and debris around hose assemblies
If any of these conditions exist, address them
appropriately.
See Table 2-1
below for the following items.
3. It is recommended that hydraulic hose assemblies
operating in Zone C be replaced after 8,000 hours of
service life.
4. Hydraulic hose assemblies operating in Zone A and
Zone B with high ambient temperatures and high-duty
circuits could see hose service life reduced by 40% to
50%. High-duty circuits can include, but are not limited
to, hoist(s), boom lift, swing, travel, pump suction and
discharge to directional valves and directional valve
return to reservoir. It is recommended to replace these
hoses after 4,000 to 5,000 hours of service life.
Table 2-1. Climate Zone Classification
CAUTION
Hydraulic System Damage!
Damage to hydraulic components and improper operation
of the crane can occur if the hydraulic system
specifications are altered.
Do not alter specifications without the approval of your
Manitowoc Cranes dealer.
CAUTION
Burn Hazard!
Personal injury may occur due to contact with oil in the
hydraulic tank that is under pressure and extremely hot.
Ensure that the hydraulic hose is de-pressurized before
loosening any connections.
Item Description
A Tropical Moist—All months average above 18°C (65°F)
Latitude—15° to 25° N & S
B Dry or Arid—Deficient precipitation most of the year
Latitude—20° to 35° N & S
C Moist Mid-Latitude—Temperate with mild winters
Latitude—30° to 50° N & S
D Moist Mid-Latitude—Cold winters
Latitude—50° to 70° N & S
E Polar—Extremely cold winters and summers
Latitude—60° to 75° N & S

Manitowoc 2250 Specifications

General

Brand	Manitowoc
Model	2250
Category	Construction Equipment
Language	English