Finn BarkBlower BB-1208 MS, Parts And Operator'S Manual

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DESCRIPTION OF VALVE SECTIONS
Figure 3 shows the valve block and the different hydraulic circuits. Each circuit, except for the Hose
Reel (HR) circuit, is controlled by two valves. On the Floor (F) and Airlock (AL) circuits, the flow rate
is controlled by the proportional valves. These valves can be manually stroked by inserting a small
rod or screwdriver into the hole in the bottom of the solenoid. The Floor and Airlock circuits also
have a directional valve that can be manually stroked by pressing the red knob on the bottom of the
solenoid. The Agitator (A) and Seed Injection (S) circuits are controlled by a three-position valve that
is actuated by one of two solenoids. These valves can be stroked manually by pressing or pulling
on the red knob located on the bottom of the solenoid. The Hose Reel (HR) circuit is controlled by a
two-position ON/OFF valve. Its solenoid can only be actuated in one direction by pressing on the red
knob, located on the bottom. The flow rates for the Hose Reel, Seed Injection, and Agitator circuits
are adjusted using the flow control valves. These valves are located directly behind the solenoids
for their respective circuits.
A. HOSE REEL
The left side of the manifold controls the hose reel. The flow rate is factory set, so the hose reel
winds and unwinds at a rate of about 13 rpm.
B. AGITATOR
The third valve section controls the speed and rotation of the agitator. The spool in this section is
factory set, so the agitator rotates at approximately 4 rpm. This section also has a pressure switch
installed on the forward port that is set for 2,400 psi (16,547 kPa). This pressure switch triggers the
agitator auto-reverse function. Normal rotation of the agitator is clockwise when viewing from the
rear of the machine.
C. FLOOR (DRAG CONVEYOR)/FEED ROLL
The fourth valve from the left controls the floor and feed roll speed. It is an electrically-driven pro-
portional valve that is controlled by the floor-speed settings on the control box. Adjusting the dial
from 0 to 100 varies the input voltage to the solenoid and moves the spool in the valve accordingly,
thus allowing more or less oil flow to the floor and feed roll. The feed roll is plumbed in series with
the floor, meaning that the oil flows to the feed roll motor first and then down to the floor motors.
This setup automatically causes the floor to slow down if the feed roll begins to jam up, which pre-
vents overfeeding of the feed roll.
FRONT
BOTTOM
HOSE REEL
SEED INJECTION
AGIT
AT
OR
FLOOR
AIR LOCK
Figure 3