Hydraulic Oil Temperature Switch - JLG sky trak mmv Service Manual

Electrical System
10.13.4

Hydraulic Oil Temperature Switch

The hydraulic oil temperature switch (1) is threaded into
a welded fitting (2) at the lower inside wall of the hydraulic
oil reservoir.
The hydraulic oil temperature switch is connected to the
wiring harness and operator's display panel. When the
hydraulic oil temperature is above 195° F (91° C), the hy-
draulic oil temperature warning indicator on the opera-
tor's display panel illuminates. The vehicle should be
stopped and the engine allowed to run at high idle for five
minutes. If the warning indicator continues to illuminate
after five minutes, the engine must be shut down to help
avoid damage in the hydraulic system. Examine the fluid
in the hydraulic oil sight glass (6) to check whether there
is a sufficient amount of fluid in the system (the oil level
should be at the bottom of the sight glass with all hydrau-
lic cylinders retracted) and whether the fluid is contami-
nated. Replace the hydraulic oil filter as required. Explore
other causes for excessive temperature, such as high air
temperature, plugged oil cooler or lines, loose fan belt,
plugged radiator, etc. (Refer to Section 10.9.3, Hydraulic
Oil Temperature Warning Indicator Troubleshooting .)
10.140
3
4
2
5
1
MT1440
6
a. Hydraulic Oil Temperature Switch Removal
1. Remove engine side battery box cover (7). Remove
wing nuts (8) and carriage bolts (9) and set cover
and mounting hardware aside for later re-assembly.
2. Disconnect the negative (-) battery cable (10) at the
battery negative (-) terminal on the battery in the
engine side battery box.
3. Disconnect the negative (-) cable (11) at the bottom
of the battery equalizer (12).
8
7
9
4. Label and disconnect the switch wiring connector (3)
from the harness connector (4).
5. Unthread the switch (1) from the hydraulic reservoir
welded fitting (2).
OT0690
12
11
10
MM2911
Model MMV Rev. 12-04