39
MAINTENANCE
Electrical
Lighting System
Etnyre trailer light wiring is color coded per SAE
specifications. The standard trailer lighting system op-
erates on 12 volt current. If the tractor electrical system
provides other than 12 volts, the trailer light bulbs must
be changed to match the tractor system voltage.
For RTN model trailers with optional self-contained
hydraulic system: See the engine manual supplied with
your trailer for troubleshooting the engine electrical
system for the self-contained hydraulic system.
Figure 30. Gooseneck Socket Connection
Ground white terminal to a convenient place on the
truck frame. This gives a dependable ground to the
trailer lights without grounding through fifth wheel.
Code
Color
Use (circuit)
W
White
Ground
BK
Black
Identification Lights
Y
Yellow
Left Turn Signal
R
Red
Stop Lights
G
Green
Right Turn Signal
BR
Brown
Tail & License Plate
Lights
Hydraulics
General
Hydraulic removable gooseneck trailers are equipped
with hydraulic systems for gooseneck operation. Hy-
draulic system pressure is supplied by the tractor pump
(in wet line systems) or by the optional hydraulic power
pack mounted in the trailer frame. Refer to the system
description and repair procedures when checking or
servicing hydraulic systems.
Hydraulic Power Pack Filter
Use only Etnyre approved parts to ensure proper
functioning. First, apply a film of oil to the gasket and
hand turn the filter until the gasket contacts the filter
head. Then tighten one-quarter turn only. Operate the
system and check for leaks.
Checking Hydraulic Reservoir Oil Level
Check the oil level with the cylinder(s) completely
retracted. Use the dipstick (see Figure 31).
Changing Hydraulic Oil
1. Retract the cylinders fully.
2. Clean around the reservoir drain plug and remove
it. Allow all the oil to drain and replace the plug
3. Clean around the reservoir fill cap. Remove the
fill cap and fill the reservoir to the full mark on the
dipstick.
CAUTION
Do not Overfill
4. Operate the hydraulic cylinders 5 times and re-
check the oil level. Add oil as required to bring the oil
level up to the "FULL" mark.
5. Replace the cap.
Hydraulic Power Pack Battery
Keep the battery full to the ring. Use distilled water
only.
CAUTION
Do not Overfill
RED
GRN
WHT
BRN
BLK
YEL
AUXILIARY
NOT USED