OPERATING CONTROLS AND PROCEDURES 777 OPERATOR’S MANUAL
3-68 Published 10-01-12, Control # 044-05 v2
• 80W-90 above: -10 to 100°F (-23 to 38°C)
• 85W-140 above: 100°F (38°C)
Hydraulic Oil
General
Optional thermostatically controlled heaters (120 or 240 volt)
can be installed in the hydraulic tank to aid in cold-weather
startup.
The heaters are designed to keep the oil temperature 30°F
(17°C) warmer than ambient air temperature. Each heater
has an extension cord for connecting to an owner furnished
electric power supply.
Hydraulic tank heaters must be unplugged when engine
is running to prevent hydraulic system from
overheating.
Change the oil in the hydraulic system to ISO Grade 15 when
the expected ambient temperature will remain at 32°F (0°C)
or below.
Change the oil in the hydraulic system to ISO Grade 46 when
the expected ambient temperature will remain above 32°F
(0°C).
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