Alamo BUSH HOG RMB 1660 Operator's Manual page 181

HYDRAULIC SYSTEM
Oil Supply
Check daily the oil level in the reservoir.
No fixed time period can be quoted for oil changes as operating conditions and maintenance standards vary so
widely. Burnt and scorched oil odors and the oil darkening and thickening are all signs of oxidation and indicate
the oil should be changed.
Moisture which results from condensation can become entrapped in the oil and cannot be removed by filtration
so that contamination is a progressive factor.
Contamination can be reduced by:
1. Cleaning off around the reservoir cap before removal, and keeping that area clean.
2. Using clean containers when replenishing the system.
3. Regular servicing of the filtration system.
Filtration Maintenance
A 125-micron suction strainer and a low-pressure 10-micron full flow return line filter protect the machine.
Suction strainer
The strainer is permanently fixed within the reservoir.
Should symptoms of pump cavitation or spongy intermittent operation occur the tank must be drained and
flushed out with a suitable cleaning agent e.g. clean diesel oil.
Return Line Filter
The elements should be changed after the first 50 hours and thereafter at 500-hour intervals. It is important to
note hours worked as if the filter becomes blocked an internal by-pass within the canister will operate and no
symptoms of filter malfunction will occur to jog your memory.
RMB 1660 01/22
© 2022 Alamo Group Inc.
MAINTENANCE
Maintenance Section 5-7