1900 YRM 1018 Operation
SOUND LEVEL
Hydraulic system noise is caused by both improperly
selected oil and loose or damaged system components.
• Hydraulic oil with high or moderately high viscosities -
At startup, temperatures can cause pump noises due
to cavitation and also impedes the release of trapped
air. Air does not have sufficient time to purge itself
from the fluid while in the reservoir before recycling
through the system.
• Aerated Hydraulic Oil - Results in system noise that is
similar to cavitation. Aerated oil is caused by the in-
gestion of air through the pipe joints of the inlet lines
and high velocity discharge lines, as well as cylinder
rod packing. Aeration can also be caused by oil dis-
charging above the fluid level.
1. HYDRAULIC POWER UNIT
2. CAPSCREW
3. WASHER
4. LOCKWASHER
5. CAPSCREW
6. FITTING
7. HOSE
8. TUBE
9. FITTING
10. ADAPTER
11. FITTING
12. LIFT CYLINDER
Figure 3. Hydraulic System - 24 Volt
3
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