9
Disc Valve Hydraulic Motor
10 000 Series
Geroler Motors—Two Speed
49 Install the splined drive.
Note: On smaller displacement motors the splined ends of the drive
are different lengths. If this is the case the longer spines go into the
bearing housing.
50 Determine which side of the Geroler goes against the wear plate.
Install the 108 mm [4.25 in.] seal and 9,5 mm [.375 in.] o-ring in the
appropriate grooves in that side of the Geroler. Apply petroleum jelly
to the seal and o-ring before installation.
51 Install the Geroler on the wear plate. Be sure to align the case
drain holes.
52 Apply petroleum jelly to the 108 mm [4.25 in.] seal and 9,5 mm
[.375 in.] o-ring. Install each in the appropriate groove in the top side
of the Geroler.
53 Install the valve drive.
Motor Timing Timing a hydraulic motor involves three steps. The
direction the output shaft rotates is determined by timing.
Timing Step #1 Locate the largest open pocket in the Geroler and mark
its position.
54 Install the valve plate on the Geroler. Be sure to align the case
drain holes.
Timing Step #2 Locate the open slot in the valve plate that is in line
with the largest open pocket in the Geroler.
Timing Step #3 Align any one of the side openings in the valve with the
open slot in the valve plate that is over the largest open pocket in the
Geroler. Engage the valve with the valve drive by rotating it clockwise
until the spine teeth mesh (1/2 spIine tooth). This will provide standard
rotation when pressurized (see Figure 21).
To reverse rotation engage the valve with the valve drive by rotating it
counter clockwise until the spline teeth mesh (1/2 spine tooth).
55 Install the control spool and springs.
56 Install the control spool plugs with new o-rings. The springs will
need to be compressed to install the second plug.
57 Tighten the control spool plugs to 81 -122 Nm [60-90 lb-ft].
58 Install the plug in the port face. Use a new o-ring and tighten the
plug to 27-46 Nm [20-34 lb-ft] (see Figure 22).
Reassembly
Figure 20
Rotate Valve
Clockwise
1/2 Tooth to
Engage Spline
Case
Drain
Alignment
Reference
Only
Valve
Plate
Valve
Drive
Largest
Open
Pocket
Reference
Mark
Any One of
Eight Ports
Open to Outside
of Valve
Case
Drain
Geroler
Figure 22
Plug with
Recess/
O-ring
Plug/O-ring
Spool, Control
Plug/O-ring
Plug/O-ring
Spring
Spring
Figure 21
Standard Timing
