Manitowoc Grove TMS700E

HYDRAULIC SYSTEM TMS700E SERVICE MANUAL
2-12 Published 01-29-2015, Control # 512-01
OIL COOLER
Description
An air cooled hydraulic oil cooler (Figure 2-4) is mounted on
the left side of the carrier forward of the fuel tank. The oil
cooler consists of a hydraulic radiator, an electric motor, and
a fan. The fan is driven by the motor and pulls air through the
cooling fins on the cooler. All hydraulic oil returns from the
major functions to two return lines which go to the reservoir.
One return line leads directly to the hydraulic reservoir filter
and bypasses the oil cooler. This line has a 448 kPa (65 psi)
inline check valve which is normally closed and does not
permit flow. Therefore, all oil is routed through the other line,
through the oil cooler, and to the oil filter in the hydraulic
reservoir. When several hydraulic functions are being used
at one time (that is, hoisting, lifting, and telescoping), more
oil has to flow through this one line, causing a pressure
buildup in the return lines. When this pressure reaches 448
kPa (65 psi), the normally closed check valve will open and
permit some oil to bypass the oil cooler and flow directly into
the reservoir filter.
A temperature switch in the return line senses hydraulic oil
temperature to control the fan motor. When the temperature
reaches 64°C (120°F), the temperature switch closes its
contacts to start the fan motor. When the temperature
decreases to approximately 44°C (112°F), the contacts will
open to stop the fan motor.
Maintenance
Removal and Disassembly
1. Tag and disconnect the hydraulic lines from the oil
cooler. Cap or plug all openings.
2. Tag and disconnect the electrical connector from the
motor.
3. Remove the bolts, washers, lockwashers, and nuts
securing the front cover. Remove the cover.
4. Remove the bolts, washers, and lockwashers securing
the cooler shroud and the cooler core to the front cover.
Remove the shroud and cooler core.
5. If necessary, remove the bolts and washers securing the
fan guard/motor assembly to the shroud. Remove the
assembly.
Assembly and Installation
1. If removed, position the fan guard/motor assembly on
the shroud and secure with the bolts and washers.
2. Position the shroud and cooler core on the cover and
secure with the bolts, washers, and lockwashers.
3. Position the front cover and secure with the bolts,
washers, lockwashers, and nuts.
4. Connect the motor electrical connector.
5. Connect the hydraulic lines to the oil cooler as tagged
during removal.
Reference Only