1-8 03-20-2019 Control # 613-06
INTRODUCTION NBT30H-2 SERVICE 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 1-1 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
recommended these hoses be inspected and addressed
accordingly.
Table 1-1: 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: Temperature 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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