19
SERVICE
GENERAL
Service instructions in this section are limited to parts and
components other than the engine and hydraulic pump.
Other major components should be serviced by representa-
tives of the respective manufacturers as follows:
ENGINE
-
Briggs and Stratton Vanguard OHV
Model-356447-0115-E1
Model-35644A-0116-E1 PowerLink models
Honda Engine 20 hp
Model-GX620K1QAB
The Briggs engine should be serviced only by
Briggs &
Stratton Industrial and Construction Equipment Dealers
.
Lawn and Garden Dealers
may not be able to offer warran-
ty work for this application. It is recommended to contact a
Central Sales & Service Distributor
for the nearest autho-
rized Briggs and Stratton representative or contact Briggs
and Stratton at 1-800-233-3723.
www.briggsandstratton.com
For a list of Honda dealers (see web site)
www.honda-engines.com
DASH PANEL & MANIFOLD
ASSEMBLY
(See Figure 2 and 3)
If it is necessary to remove the manifold assembly, the
manifold (7, fi g. 2) has no internal parts and it would be a
rare case that the manifold would need replacing. The parts
attached to the manifold are as follows Directional valve
(27, fi g. 2), Pressure switch (26, fi g. 2) , Relief valve (24, fi g.
2), Coil (29, fi g. 2) and attached hoses, couplers and plugs.
NOTE:
Disconnect the battery terminals before servicing the
manifold assembly or any dash panel components.
MANIFOLD ASSEMBLY REMOVAL
1. Remove hose clamp (3, fi g. 3) from the hose near the
manifold assembly, then remove the hose (10, fi g. 3).
2. Remove hose (7, fi g. 3) from the manifold assembly,
again hydraulic oil will drain from this hose.
3. Disconnect the wiring harness plugs from the pressure
switch (26, fi g. 2) and from the directional valve (27, fi g. 2).
4. While holding the manifold assembly in one hand, re-
move the 2 capscrews (6, fi g. 2) and remove the manifold
out through the back of the dash panel.
5. Reinstall in the reverse order.
RELIEF VALVE
(See Figure 2, Item 24).
DESCRIPTION:
The relief valve allows oil to by-pass to
the reservoir when the system pressure reaches a pre-set
setting. The relief valve is set to by-pass at a "cracking"
pressure of 2100-2300 psi/145-158 bar.
While adjustments can be made to the relief setting (see
TESTING and TROUBLESHOOTING), the parts of the
relief valve are not serviceable.
To adjust or remove the relief valve, follow the steps under
“Testing the Hydraulic Circuit” in the TESTING and TROU-
BLE SHOOTING section of this manual.
DASH PANEL SWITCH REMOVAL
1. Disconnect the battery.
2. Disconnect the wire harness plugs from the back of the
switches before removing them.
3. To remove the switches from the dash panel, push in on
the sides of the switch from the inside or back of the dash
panel. You will fi nd four plastic narrow strips that must be
pushed in while the switch is being pulled out from the front
of the dash panel.
4. Reinstall in reverse order.
ENGINE & RELATED
COMPONENTS
ENGINE
Most engine servicing can be performed without removing
the engine. Consult with your Briggs and Stratton or Honda
Dealer regarding engine repairs.
Hydraulic oil will drain from this hose, take
steps to clamp off hose or drain the hydraulic
tank.
CAUTION
Summary of Contents for GT18
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