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Published 6-20-2014, Control# 516-01
Warm-up Procedures for Temperatures Below -7°C
(20°F):
1.
Ensure the boom is fully retracted and near maximum lift
angle with no load applied.
2.
Rotate the superstructure at a speed of less than one-
half RPM for at least two complete revolutions in one
direction, then rotate the superstructure at a speed of
less than one-half RPM for at least two complete
revolutions in the opposite direction.
Axles
NOTE:
For National Crane axle warm-up procedures, refer
to chassis manufacturer’s manual.
Warm-up Procedures for Temperatures Below -35°C
(-30°F):
1.
Setup the crane on outriggers.
2.
Engage the transmission and allow it to run at idle until
the temperature of the axle sump reaches normal
operating temperature.
Hydraulic Oil System
Operating Limits and Warm-up Procedures:
•
From 4°C to -10°C (40°F to 15°F):
Crane operation
without a load is allowed with medium engine RPM and
medium function speed (joystick position) until the fluid
reaches at least 10°C (50°F). It is then recommended
that all crane functions be cycled to remove cold fluid
from all components and cylinders of the hydraulic
system. If there is any unusual sound coming from the
crane’s hydraulic pumps or motors, stop the operation
and engine immediately and contact a Manitowoc
distributor.
•
From 10°C to 4°C (50°F to 40°F):
Crane operation with
a load is allowed with medium engine RPM and medium
function speed (joystick position) until the fluid reaches
at least 10°C (50°F).
•
From 95°C to 10°C (200°F to 50°F):
Crane operation
with a load is allowed with no restrictions.
•
Above 95°C (200°F):
No crane operation is allowed. Let
the crane’s hydraulic oil cool by running the engine at
idle with no functions actuated.
Reference Only
