11
Section IV
–
Installation and Operating Instructions
A. Installation Drawings
The installation drawings M-259218 and M-259219 should
be consulted for installation dimensions.
B. Mounting
These valves can be mounting in any position. Enough
clearance must be left to provide access to the port connec-
tions and to permit actuating the control mechanism. The
valves should be securely bolted to the mounting surface.
NOTE
Valves should be mounted on a relatively flat surface
to prevent possible distortion of the valve bodies.
C. Port Connections
All connections are compatible with standard SAE fittings
and O-ring seals. It is only necessary to tighten fittings so
that there is a firm metal-to-metal contact.
D. Relief Valve
Relief valve sub-assemblies in the inlet section are preset
and tested for given pressure settings. Selection of the relief
valve setting is based on the work requirements of the
system. If a different relief valve setting is required, the valve
sub-assembly should be replaced (see parts catalog
M-2401-S, M-2402-S, M-2403-S or M-2404-S).
E. Tandem Installation
1. Piping arrangement for tandem series operation is
shown in Figure 8.
2. The outlet section of the first bank must be an
“
E
”
section which is equipped with a plug (see Figure 8) to block
the primary discharge port from tank. The discharge to tank
port must be connected to tank.
NOTE
Slight leakage past the internal plug is permissible.
The plug should not be tightened excessively, as
there is the danger of distorting the body and caus-
ing the spool to bind.
F. Hydraulic Tubing
NOTE
For instructions on pickling, refer to Instruction
Sheet M-9600.
1. All tubing must be thoroughly cleaned before installa-
tion to remove dirt, rust and scale. Recommended methods
of cleaning are sand blasting, wire brushing and pickling.
2. The number of bends in tubing should be kept to a mini-
mum to prevent excessive turbulence and friction of oil flow.
3. Tubing should not be bent too sharply. The minimum
radius for bends is three times the inside diameter of the tube.
4. To minimize flow resistance and the possibility of
leakage, only as many fittings and connections as are nec-
essary for proper installation should be used.
G. Hydraulic Fluid Recommendations
The oil in a hydraulic system serves as the power transmission
medium. It is also the system
’
s lubricant and coolant. Selection
of the proper oil is a requirement for satisfactory system perfor-
mance and life. Oil must be selected with care and with the as-
sistance of a reputable supplier.
Two Important Factors in Selecting an Oil are:
1.
Antiwear Additives
- The oil selected must contain the
necessary additives to insure high antiwear characteristics.
2.
Viscosity
- The oil selected must have proper viscos-
ity to maintain adequate lubricating film at system operating
temperature.
Suitable Types of Oil are:
1.
Crankcase Oil meeting API Service Classification
MS
. The MS (most severe) classification is the key to proper
selection of crankcase oils for Mobile hydraulic systems.
2.
Antiwear Type Hydraulic Oil
- There is no common
designation for oils of this type. However, they are produced
by all major oil suppliers and provide the antiwear qualities of
MS crankcase oils.
3.
Certain Other Types of Petroleum Oils
are suitable for
Mobile hydraulic service if they meet the following provisions:
a. Contain the type and content of antiwear com-
pounding found in MS crankcase oils or have passed pump
test similar to those used in developing the antiwear type
hydraulic oils.
b. Meet the viscosity recommendations shown in the
following table.
c. Have sufficient chemical stability for Mobile hy-
draulic system service.
The following types of oil are suitable if they meet the above
three provisions:
Series 3 Diesel Engine Oil
Automatic Transmission Fluid Types A, F and DEXRON
Hydraulic Transmission Fluid Types C-1 and C-2
The following table summarizes oil types recommended for
use with Vickers equipment in Mobile hydraulic systems by
viscosity and service classification.
Hydraulic System
Operating
Temperature Range
(Min.* to Max.)
SAE
Viscosity
Designation
0
°
F. to 180
°
F.
0
°
F. to 210
°
F.
50
°
F. to 210
°
F.
Table 3.
American Petroleum
Institute (API)
Service Classification
10W
10W-30**
20-20W
MS
MS
MS
* Ambient Start Up Temperature
** See paragraph on Viscosity Index
Operating Temperature:
The temperatures shown in Table 3 are cold start-up to maxi-
mum operating. Suitable start-up procedures must be fol-
lowed to insure adequate lubrication during system warm-up.
