Mercury 40 Service Manual page 420

Down Circuit
With the engine tilted up, the piston inside the accumulator piston (d) will be at the bottom
of the accumulator (c) and the gas pressure is low. To lower the engine, the camshaft lever
(f) is rotated down, the internal cam will cause the push rods to open the accumulator check
valve (e), both fast transfer valves (h & j) and the down circuit slow transfer valve (i). The
operator will have to press down on the engine cowl to overcome the pressure inside cylin-
der. Fluid will flow out of the bottom of the cylinder, past both the down circuit fast transfer
valve (h) and down circuit slow transfer valve (i). Fluid will flow past the up circuit fast transfer
valve (j), surge valve (k) and through the interconnecting passage into the top of the cylinder
(l). Due to the shock rod (a), the tilt cylinder cavities differ in volume, the extra fluid from the
up cavity [forced into the accumulator (c)] will cause the internal accumulator piston (d) to
compress the gas. With the engine in the correct position, the camshaft lever is rotated up
and the push rods allow the check valves (e, h, i, & j) to close.
a -
b -
c -
d -
e -
g -
h -
k -
m -
n -
o -
p -
90-828631R3 MARCH 1999
Shock Rod
End Cap
Accumulator
Accumulator Piston
Accumulator Check Valve
f - Camshaft Lever
Manifold
Down Circuit Fast Transfer Valve
i - Down Circuit Slow Transfer Valve
j - Up Circuit Fast Transfer Valve
Surge Valve
l - Cylinder
Memory Piston
Shock Piston
Shock Return Valve
Impact Relief Valve
MANUAL TILT ASSIST
Page 5D-7