14 1/2" Closed Mouth Trailer-Mounted Bucking Unit
Section Contents
8.4
Technical Manual
BEST BY FARR
TM
3. REASSEMBLY
With GM-series motors the shaft and cylinder sub-assemblies are mounted on the motor cover and not in the
motor body as with M-series motors. Before proceeding with the reassembly of the motor:
• Ensure that the lubrication channels in the cylinder trunnion seats of both motor body and cover are clean.
• Check that the distribution plane on top of the motor cover is perfectly flat and smooth.
A. SHAFT SEAL
Ensure that the shaft seal in the motor body has not been damaged. Replace if necessary.
B. BEARING ASSEMBLY
To avoid the possibility of damage to the bearing seat in the motor cover or the motor body caused by
edges on the external diameter of the bearing race the motor body or cover should be heated to a tempera-
ture of 80°C before inserting the bearing. Alternatively smooth down any edges, even slight ones and espe-
cially in the area of the corner fillets, that may have remained after the machining processes. Roller bear-
ings: to avoid the possibility of axial shocks the outer bearing race should be placed in the motor cover or
body and the inner race should be assembled to the shaft. Ball bearings: these should be inserted in the
motor body or cover (and not assembled to the shaft).
C. SHAFT ASSEMBLY
Replace the piston retaining ring, spring and C-clip to the rear-side of the piston support ring. Dislodge the
C-clip from the front-side of the piston support ring. Insert the shaft in the bearing seat in the motor cover,
in the case of ballbearings using a rubber hammer to tap it home. (Keep shaft shoulder 0.250 away from
bearing race.)
D. CYLINDER ASSEMBLY
Insert O-ring and plastic slipper seal in the cylinders. Insert O-ring, plastic ring seal, steel ring and shaped
insert into the cylinder trunnions. Insert the pistons in the cylinders. Place the longer cylinder trunnion con-
taining the seal into the trunnion seat in the motor cover. Slide the piston out onto the piston support ring
and place the lip of the piston foot between the piston retaining ring and the piston support ring. Using an
appropriate lever ensure that the piston foot comes into full contact with the piston support ring. It may be
necessary to lift the cylinder and shaft out of their seats a little to facilitate the operation. Repeat for all five
cylinders. Position the front retaining ring and spring over the piston feet and insert C-clip. By tapping light-
ly with a rubber hammer on the cylinder trunnions and shaft-end ensure that cylinders and shaft are prop
erly seated.
E. MOTOR BODY AND COVER ASSEMBLY
Grease all the motor cover and body O-ring seats, position O-rings, and insert the locating pins. Position
the motor body aligning the trunnion seats with the cylinder trunnions and gently lower the motor body into
place, taking care not to damage the shaft seal. For motors with the O-rings between the cover and body,
it is advisable to insert the bolts in the cover to ensure that the O-rings are correctly positioned when clos-
ing the motor. Turn the motor over so that the shaft points downwards, insert and tighten the motor cover
closing bolts.
IMPORTANT: DO NOT HAMMER THE DISTRIBUTION SURFACE IN THE CENTER
OF THE MOTOR COVER. USING AN APPROPRIATE LEVER INSERTED IN THE
DISTRIBUTOR DRIVE-PIN SLOT ENSURE THE SHAFT ROTATES THROUGH 360°
WITHOUT EXCESSIVE OR VARIABLE RESISTANCE.
See Section 8.1.B, Page 8.2, Special Tool #3
Hydraulic Motor Service Information
(45 paginas)
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