SkyTrak 6042 Service Manual - Manual (Page 479)

9.109 Model 6042 Legacy Origin 7/02
Electrical System
Examine the fluid in the hydraulic oil sight glass
(Fig. 9-89, 1) 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 9.9.4, “Hydraulic Oil
Temperature Warning Indicator Troubleshooting.”)
Figure 9-89 Examine the Fluid in the
Hydraulic Tank Oil Sight Glass
a. Hydraulic Tank Oil Temperature Switch Removal
1. Disconnect the negative (–) battery cable at the
negative battery terminal (Fig. 9-87, 1).
2. Drain oil from the hydraulic tank reservoir into a
clean container for reuse.
3. Label and disconnect the temperature switch wiring
connector (Fig. 9-88, 3) from the harness connector.
4. Unthread the switch (Fig. 9-88, 1) from the hydraulic
reservoir welded fitting (2).
b. Hydraulic Oil Temperature Switch Disassembly
DO NOT disassemble the hydraulic oil temperature
switch. Replace a defective or faulty switch with a new
switch.
c. Hydraulic Oil Temperature Switch Cleaning and
Drying
DO NOT submerge the hydraulic oil temperature switch.
Clean only with an approved solvent and dry with a clean,
lint-free cloth.
d. Hydraulic Oil Temperature Switch Inspection and
Replacement
Inspect switch wiring for continuity and shorting. Replace
a defective or faulty switch with a new switch.
e. Installation and Testing
1. Thread the switch (Fig. 9 -88, 1) into its fitting (2) on
the hydraulic reservoir. Tighten securely.
2. Fill hydraulic oil reservoir with hydraulic oil.
3. Connect the switch wiring connector lead
(Fig. 9 -88, 3) to the harness connector.
4. Connect the negative (–) battery cable to its battery
terminal (Fig. 9-87, 1).
5. Clear the area around the vehicle of personnel and
any obstructions to vehicle travel.
6. Start the engine, check for hydraulic fluid leaking at
the hydraulic oil temperature switch and allow the
hydraulic fluid to reach operating temperature. Cycle
the boom several times and check whether the
hydraulic oil temperature warning indicator
illuminates on the operator’s display panel.
OH2340 1