HY28-2668-01/GC/NA,EU
GOLD CUP
®
Series - Application Manual
Piston Pumps & Motors
4.8
Parker Hannifin Corporation
Hydraulic Pump Division
Marysville, Ohio USA
Section 4
Just prior to shipment, all filter elements should be changed so the customer receives a
machine with new elements. Specific maintenance instructions should be provided to machine
owners which detail filter and fluid change intervals.
There are two standard shaft configurations available in the GOLD CUP
®
series.
They are:
(2) SAE spline
(3) SAE key
Selection of the proper type shaft is an important consideration in applying GOLD CUP
®
pumps and motors. Keyed and splined shafts are unique in their design and application and
may not be freely interchanged one for the other.
In general, keyed shafts are applied when a device is to be firmly and rigidly affixed to the
shaft. These devices include pulleys, sprockets, fans, one-half of flexible couplings, etc. The
shaft itself must be rigidly supported by the bearings in the unit and the device attached to
the shaft must be solely supported by the shaft. If the device connected to the shaft cannot be
rigidly affixed to the shaft or supported solely by it, a keyed shaft should not be used.
Splined shafts are to be applied whenever the shaft is to be coupled directly to a supported
receiver. These types of devices include gear boxes, PTO drive pads, brake assemblies, etc.
Splined shafts should also be used when two rigidly supported shafts are connected by a
floating coupling. An example is when a thru-splined coupler is used to connect two splined
shafts.
Keyed shafts in GOLD CUP
®
pumps are limited in the number of pressure cycles the pump is
subjected to. Please consult the appropriate sales bulletin for these limitations.
If these limits will be exceeded splined shafts must be used. Because in many cases these
applications would normally call for use of keyed shafts, special consideration must be taken
in the selection of the coupling. Both shafts must be rigidly supported and properly aligned. If
the other shaft is splined, a thru-splined sleeve may be slipped over both shafts. If the other
shaft is keyed, a semi-rigid coupling must be used. This type of coupling mounts rigidly on the
keyed shaft and allows the splined half to float. The floating half is then splined to slip over the
splined shaft.
Do not set screw the floating half to the splined shaft
.
In all applications the pitch diameter of the mating splines must be square to the mounting
surface within .001” per inch, .001mm per millimeter of shaft extension. Angular misalignment
should be measured over pins at 180° rotation, for two points on the shaft 90° apart.
Female splines mating to Parker splines must be hardened to within 27 to 45 Rc to reduce
wear and the splined interface must be lubricated with high quality gear lubricant. For shafts
that will not be bathed continually in lubricant we recommend lubrication with lithium mo-
lydisulfide grease.
All female splines mating to Parker shafts must conform to SAE-J498B (1971). This is known
as a Flat Root Side Fit.
When applying keyed shafts care must be taken to insure that the key is fully engaged be-
tween both the shaft and the receiver. The key then must be set-screwed in place to prevent
pounding of the key. It is highly recommended that the keys be heat treated to between 27
and 34 Rockwell C. Both shafts, when using a flexible coupling, must be aligned to the cou-
pling manufacturer’s specifications.
Proper adherence to these specifications will insure maximum life of the shaft and shaft bear-
ings.
SHAFT TYPE SELECTION
APPLYING SPLINED SHAFTS
APPLYING KEYED SHAFTS
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