HYDRAULIC SYSTEM MLC165-1 SERVICE/MAINTENANCE MANUAL
2-18
Published 05-26-17, Control # 238-02
Inspecting and Replacing Hydraulic Hoses
Periodic Inspection
Visually inspect all hydraulic hose assemblies every month
or at 200 hours of service life for:
• Leaks at hose fittings or in hose
• Damaged, cut or abraded cover
• Exposed reinforcement
• Kinked, crushed, flattened or twisted hose
• Hard, stiff, heat cracked or charred hose
• Blistered, soft, degraded, or loose cover
• Cracked, damaged or badly corroded fittings
• Fitting slippage on hose
• Other signs of significant deterioration
If any of these conditions exist, evaluate the hose
assemblies for correction or replacement.
At the same service interval, visually inspect all other
hydraulic components and valves for:
• Leaking ports
• Leaking valve sections or manifolds and valves installed
into cylinders or onto motors
• Damaged or missing hose clamps, guards, or shields
• Excessive dirt and debris around hose assemblies
If any of these conditions exist, address them appropriately.
Periodic Replacement
Hydraulic hose assemblies operating in zone C (Table 2-2)
should be replaced after 8,000 hours of service life.
Hydraulic hose assemblies operating in zones A and 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. Replace hoses
operating in zones A and B after 4,000 to 5,000 hours of
service life.
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. Cold temperatures shorten hose life,
therefore frequent inspection is required.
Table 2-2 Climate Zone Classifications
CAUTION
Hydraulic Component Damage
Do not alter hydraulic system specifications given in this
section without approval of the Manitowoc Crane Care
Lattice Team.
Damage to hydraulic components and improper operation
of crane can occur if specifications are altered.
CAUTION
Burn Hazard
Oil in hydraulic tank may be under pressure and
extremely hot.
Ensure that the hydraulic hose is de-pressurized before
loosening any connections.
Zone Description
A
Tropical Moist: All months average above 65° F
(18° C). Latitude: 15° - 25° N & S
B
Dry or Arid: Deficient precipitation most of the
year. Latitude: 20° - 35° N & S
C
Moist Mid-Latitude: Temperate with mild winters.
Latitude: 30° - 50° N & S
D
Moist Mid-Latitude: Cold winters.
Latitude 50° - 70° N & S
E
Polar: Extremely cold winters and summers.
Latitude: 60° - 75° N & S
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