CONTROL PANEL
RETURN
PRESSURE
H.T.M.A. 1/2 INCH MALE
QUICK DISCONNECT
COUPLER
H.T.M.A. 1/2 INCH
FEMALE QUICK
DISCONNECT COUPLER
1/2 INCH I.D. HOSE, 25 FT
LONG WITH 2500 PSI/
172 BAR RATING AND
4 TO 1 SAFETY FACTOR
PRESSURERETURN
1/2 INCH MALE PIPE
HOSE END
1/2 INCH MALE PIPE
HOSE END
ADAPTER, 3/8 INCH MALE
PIPE x -8 SAE O-RING
H.T.M.A. 1/2 INCH MALE
QUICK DISCONNECT
COUPLER
H.T.M.A. 1/2 INCH
FEMALE QUICK
DISCONNECT COUPLER
TOOL
PRESSURE
RETURN
quick disconnect fittings (NPT type threads).
(See Figure 1.)
Longer hoses may be used when necessary,
but can effect the operation of the engine
automatic throttle due to fluid resistance in the
hose. If small diameter or long hoses are
used, or if restrictive fittings are connected to
the supply and return ports, the pressure
required to push the fluid through the system
and back to the hydraulic tank will be higher.
If the pressure is too high, this will cause the
engine RPM to remain at full load if "AUTO" is
selected on the automatic throttle. Also see
"HYDRAULIC HOSE REQUIREMENTS"
earlier in this manual.
QUICK DISCONNECT COUPLERS
H.T.M.A. approved quick disconnect couplings
are installed to hydraulic hoses so that the
direction of oil flow is always from the male to
the female quick disconnect as shown in figure
1. Quick disconnect couplings and hose
fittings are selected so that additional fittings
such as reducer or adapter fittings are not
required.
If adapter fittings are used, they must be
approved steel hydraulic fittings meeting a
minimum operating pressure rating of 2500
psi/172 bar. Do not use galvanized pipe
fittings or black pipe fittings.
Use thread tape or pipe joint compound when
installing quick disconnect couplings to hose or
tool fittings. Follow the instructions furnished
with the selected thread sealant. DO NOT
OVERTIGHTEN THE FITTINGS.
Figure 1. Hydraulic Connections
8
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