Manitowoc Published 11-06-15, Control # 040-13 1-103
2250 SERVICE/MAINTENANCE MANUAL INTRODUCTION
HYDRAULIC COOLER FAN DRIVE — TIER 4
ONLY
See Figure 1-66 for the following procedure.
Description
The Cooler Fan Drive assembly includes two hydraulic motor
driven, variable-speed fans. Each fan is 29.5 inches
diameter and has seven blades. The accessory pump
supplies the pressure to run the fan motors. As engine load
increases, fan speed will also increase to meet the engine’s
cooling needs.
NOTE: If there is an electrical failure the fan will default to
high-speed operation only.
A variable-speed fan provides several benefits over fans for
which operating speed is determined by engine speed.
These benefits include quieter operation, higher efficiency
and longer fan life. This type fan also helps keep the engine
running more consistently at its optimal temperature and
results in increased available engine power when full fan
speed is not required.
See the engine manufacturer’s operating instructions
manual for diagnostic information.
Maintenance
Fan speed is determined by the greatest demand of four
inputs: coolant temperature, air intake temperature (IMT),
hydraulic oil temperature and the state of the air conditioning
clutch. The system monitors these inputs every ten seconds
and adjusts the fan speed depending on the input readings.
A high temperature fault may be triggered by a coolant, air
intake, or hydraulic oil temperature that exceeds the normal
temperatures. If such a fault occurs the operator or service
person should investigate the cause.
FIGURE 1-66
Main Pressure
Through Accessory
Pump
Fan Motor #2
Fan Motor #1
Pump
20.7 bar
(300 psi)
276 bar
(4000 psi)
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