Service Manual User Manual

Section 9
9-80
9.9.3 Auxiliary Function Manifold
The auxiliary function manifold (Fig. 9–55) is located
near the battery, secured to a bracket at the hydraulic
fluid
reservoir/engine mount with two capscrews and lock-
washers.
Figure 9–55. The auxiliary function manifold
is located near the battery.
The auxiliary function manifold (Fig. 9–56) is a machined
block with ports for three pressure reducing valves, two
solenoid valves, and related hose fittings. The auxiliary
function manifold also contains a check valve that can be
replaced if defective.
Pressure reducing valve “PS” is set at 2500 psi (172 bar);
valve “PB” is set at 550 psi (38 bar), and the pressure
relief valve is set at 650 psi (45 bar).
Verify the correct operation of the solenoids before con-
sidering replacement of the auxiliary function manifold.
The manifold itself is not serviceable and must be
replaced in its entirety if replacement of parts does not
solve the problem.
DO NOT loosen, disassemble or attempt to adjust any of
the pressure valves unless specifically instructed by Sky
Trak to do so! Tampering with a pressure valve will irre-
vocably alter pressure in the affected circuits. A new
pressure reducing valve will be required to rectify the sit-
uation.
a. Auxiliary Function Manifold Replacement
1. Park the vehicle on a firm, level surface, fully retract
all hydraulic cylinders, ground the attachment (if any),
place the travel select lever in NEUTRAL (N), engage
the park brake switch and shut the engine OFF.
Figure 9–56. Auxiliary function manifold components.
1. Unlatch, unlock and open the engine cover. Allow the
hydraulic fluid to cool.
2. Label or otherwise mark the hydraulic hoses in
relation to the auxiliary function manifold (Fig. 9–55).
Disconnect and cap all hoses, fittings, solenoid wire
terminal leads, etc.
3. Remove the auxiliary function manifold from the
vehicle. Wipe up any hydraulic fluid spillage in, on,
near and around the vehicle.
Auxiliary Function
Manifold
Battery
MS2100
WARNING: Hot hydraulic fluid can cause
severe burns. Wait for hydraulic fluid to cool
before servicing any hydraulic component.
WARNING: Escaping hydraulic fluid under
pressure can penetrate the skin, causing seri-
ous injury. Relieve hydraulic pressure before
servicing any hydraulic component.
P
PS
PSG
T
PB
PBG
PPG
PP
Pressure Reducing
Valve “PS”
Pressure Reducing
Valve “PB”
Pressure Relief
Valve
Solenoid
Check
Valve
Solenoid
MS2030
Model 3606 • Origin 10/99