Lull 944E-42 Service Manual - Manual (Page 726)

Electrical System
9.216 Model 644E-42/944E-42 Rev. 6/04
9.14.4 Dual Hydraulic Oil Temperature
Switch
The hydraulic oil temperature switch (1) is threaded into
a fitting (2) at the lower inside wall of the hydraulic oil
reservoir.
The hydraulic oil temperature switch is connected to the
wiring harness and front dash panel. When the hydraulic
oil temperature is above 195° F (91° C), the hydraulic oil
temperature warning indicator on the front dash 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 (3) 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 hydraulic cylinders retracted) and whether
the fluid is contaminated. 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 9.10.7, “Dual
Hydraulic Oil Temperature Warning Indicator
Troubleshooting.”)
a. Hydraulic Oil Temperature Switch Removal
1. Unlock and open the engine cover (6).
2. If the vehicle has dual batteries, disconnect both
negative battery cables (8 and 9) from both
batteries.
To access the lower battery (10), loosen the
knob (11) far enough so that the lip (12) on the upper
battery box clears the knob. Lift up the upper battery
box (13) and swing it out, so that the box clears the
hydraulic tank support bracket, to gain access to the
lower negative battery cable (8). Disconnect the
lower negative battery cable.
MU3740
1
2
3
4
5
4110390
1.
2.
OU0780
7
7
6
MU0650
8
9
10
11
12
13