INTRODUCTION RT880E SERVICE MANUAL
1-12 Published 11-10-2014, Control # 524-00
components. Installation of new elements is always
recommended.
Hydraulic Lines
When installing metal tubes, tighten all fittings finger-tight.
Then, in order, tighten the fittings at the rigid end, the
adjustable end, and the mounting brackets. After tubes are
mounted, install the hoses. Connect both ends of the hose
with all fittings finger-tight. Position the hose so it does not
rub the machine or another hose and has a minimum of
bending and twisting. Tighten fittings in both couplings.
Due to manufacturing methods there is a natural curvature to
a hydraulic hose. The hose should be installed so any bend
is with this curvature.
Visual Inspection of Hoses and Fittings
1. Visually inspect hoses and fittings once a month or
every 250 hours for the following:
• Leaks at hose fitting 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 the above conditions exist, evaluate hose
assemblies for correction or replacement. For replacement
of hose assemblies, refer to your Manitowoc Crane Care
Parts Manual.
2. At the same service interval, visually inspect all other
hydraulic components and valves for the following:
• 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 the hose
assemblies.
If any of these conditions exist, address them appropriately.
3. All hydraulic hose assemblies are recommended to be
replaced after 8000 hours of service life.
4. Hydraulic hose assemblies operating in a temperature
climate zone “C” Table 1-2 are recommended to be
replaced after 8000 hours of service life.
5. Hydraulic hose assemblies operating in climate zones
“A” and “B” with high ambient temperatures, could see
hose service life reduced by 40 to 50%, therefore, it is
recommended to replace these hoses after 4000 to
5000 hours of service life.
6. Hydraulic hose assemblies operating in climate zones
“D” and “E” should expect a degradation of mechanical
properties such as elasticity, therefore, it is recom-
mended these hoses be inspected and addressed
accordingly.
Table 1-2: Climate Zones
Zone Classification
A Tropical Moist: All months average above 18° C. Latitude 15° - 25° North and South
B Dry or Arid: Deficient precipitation most of the year. Latitude 20° - 35° North and South
C Moist Mid-Latitude: Temperate with mild winters. Latitude 30° - 50° North & South
D Moist Mid-latitude: Cold winters. Latitude 50° - 70° North & South
E Polar: Extremely cold winters and summers. Latitude 60° - 75° North & South
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