Chrysler RAM TRUCK 2500 1994 Service Manual page 918

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BUMPERS AND FRAME 13 - 5
SNOW PLOW
INDEX
page
Power Angling Cylinder Service 19
Power Unit 16
Service Information 5
Snow Plow Control Module 20
Snow Plow Frame 19
page
Snow Plow Malfunction Diagnosis and Tests . . . . . . 6
Snow Plow Pivot Bracket 19
Snow Plow Wiring Diagrams 6
System Description and Operation 5
SERVICE INFORMATION
The snow plow option is available on four wheel drive
BR vehicles. Refer to figure 1 for primary mechanical
components.
LIFT A R M
RUNNERS J9001-2
Fig. 1 Snow Plow Components
COMPONENT
D E S C R I P T I O N
The primary snow plow components are described
within the following list:
• Moldboard—Snow blade constructed from high
tensile steel.
• Trip Springs—Allow the moldboard to tilt forward
and slide over obstructions without losing the snow load.
• Sector—Used for positioning the moldboard
• straight ahead or angling i t to the right or left.
• Sector Shear Pin—Self-locking pin that locks the
moldboard i n either a straight ahead or an angled
plowing position.
If the Made impacts obstructions, t h e p i n will
shear to protect the snow plow a n d the vehicle
from damage. The pin is not used with power
angle plowing.
• Power Angling Cylinders—Enable the operator to
move the moldboard either straight ahead or to the side.
• Hinge Pins—Allows the A-Frame to pivot up and
down. The pins act as moldboard attaching points.
• Cutting Edge—Replaceable blade edge extends
the life of the blade.
• Runners—Adjustable runners retain the cutting
edge at the proper height.
• Sno-Flo Paint—Specially developed high-visibil­
ity, yellow paint provides fast, smooth snow-rolling
action.
• Hydraulic Pump/Motor—Hydraulically lifts,
lowers and angles the snow plow.
• A-frame—Provides the means for attaching the
snow plow to the vehicle.
• L i f t Arm—Raises and lowers the snow plow.
SYSTEM DESCRIPTION AND OPERATION
H Y D R A U L I C CYLINDER AND MOTOR
The hydraulic cylinder and motor unit is designed
to raise, lower and angle the blade.
The power unit is a high torque, 12-volt motor that
is coupled to a gear-type hydraulic pump.
The toggle switches operate the solenoid valves.
The following components control the snow plow
blade positioning:
• Solenoid valves designated A,B, and C.
• Mechanical hydraulic check valves.
• Pilot check valve.
• Crossover relief valve.
SOLENOID (ELECTRO-MECHANICAL)
VALVES
Three solenoid valves are used for snow plow con­
trol. Each valve is comprised of two components:
• Cartridge—Comprised of a valve and a solenoid.
• Coil—The electrical component that retracts the
cartridge solenoid.
With power applied, the solenoid retracts and pulls
the poppet valve into the OPEN position.
When power is turned off, the spring forces the so­
lenoid back to its normal, CLOSED position.