HYDRAULIC SYSTEM GRT9165 SERVICE MANUAL
2-12
Published 10-01-2020 Control # 699-00
HYDRAULIC OIL COOLER
Description
An air cooled hydraulic oil cooler (Figure 2-3) is located on
the right side of the superstructure.
The hydraulic oil filter is connected to the T1 port on the Main
Directional Control Valve and swivel port 1.The return oil
circuit for all other functions is directed through the hydraulic
oil cooler and on to the hydraulic oil filter. A 30 psi check
valve in this return oil circuit diverts oil to the return circuit
which bypasses the hydraulic oil cooler if the return oil
pressure ever increases due to several functions being
operated simultaneously.
A hydraulically driven fan pulls cool air through the cooling
fins on the two coolers. The fan is turned on and off as
needed by a temperature switch (190°F rising) that is
installed in the hydraulic oil tank. A thermistor (200°F rising)
is installed in the hydraulic oil tank which will cause a warning
light in the cab to illuminate if the hydraulic oil temperature is
too high. The thermistor will also turn on the oil cooling fan if
the temperature switch fails.
Maintenance
The oil cooler should be checked daily for dirt buildup, as a
dirty cooler will result in high oil temperatures. High oil
temperatures will reduce the performance and useful life of
the oil, which can ultimately result in component failure.
If the cooler is contaminated with dust, it can be cleaned
using compressed air. If the cooler is contaminated with a
mixture of oil and dust, it should be disassembled and
treated with a liquid cleaner, then cleaned of debris using
compressed air. Take care when using compressed air, a
high pressure washer, or a steam cleaner, as the fins of the
cooler may be damaged. To ensure effective cleaning, the
direction of air, water, or steam must be opposite to the
direction of normal airflow through the cooler. On cranes that
operate in corrosive environments (salt), frequently clean the
cooler with water to help prevent corrosion.
Removal
1. Tag and disconnect electrical connectors (2, Figure 2-3)
from the fans (1).
2. Tag and disconnect hydraulic lines.
NOTE: The hydraulic oil cooler fan assembly weighs
approximately 90.9 kg (198.4 lb).
3. Remove nuts (5), washers (6), lockwashers (7), and
capscrews (8). Remove hydraulic oil cooler assembly
from superstructure frame (9).
4. Remove nuts (13), capscrews (10), lockwashers (11),
washers (12), and core assembly (3) from the fan
shroud assembly (4).
5. Remove capscrews (14), washers (15), and fans (1)
from core assembly (3).
Installation
1. Install the fans (1) on the core assembly (3) with
washers (15) and capscrews (14). Torque the nuts
according torque specifications cited in Fasteners and
Torque Values, page 1-16.
2. Install the core assembly (3) in the shroud assembly (4)
with capscrews (10), lockwashers (11), washers (12),
and nuts (13). Torque the nuts according torque
specifications cited in Fasteners and Torque Values,
page 1-16.
NOTE: The hydraulic oil cooler fan assembly weighs
approximately 90.9 kg (198.4 lb).
3. Install the oil cooler assembly on the superstructure
frame (9) with capscrews (8), lockwashers (7), washers
(6), and nuts (5). Torque the nuts according torque
specifications cited in Fasteners and Torque Values,
page 1-16.
4. Connect the hydraulic lines as tagged.
5. Install electrical connectors (2) as tagged.
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