B - Ardiehl.de

HYDROSTATIC PUMP (Cont’d)
Assembly (Cont’d)
To seat the snap ring, loosen the nut until the centering
screw is loose [A].
Tighten the nut until all axial looseness is removed
between the centering screw and spring guides but stop
tightening the nut before the spring assembly becomes
loose in the piston [A].
NOTE: It will be impossible to set the pump neutral
position if there is any free play between the
piston and spring assembly or between the
spring assembly and centering screw.
While holding the nut, tighten the jam nut to 18–27 ft.–lbs.
(24–37 Nm) torque.
Install the rings, O–rings and seals as shown in Figure
[B]:
Apply oil to two new bearing rings (Item 1) [B], two new
O–rings (Item 2) [B] and two new seals (Item 3) [B].
Install a bearing ring (Item 1) [B] and O–ring (Item 2) [B]
onto each end of the piston.
Install a seal (Item 3) [B] over the O–ring on the end
opposite the centering screw.
Apply oil to the spool. Carefully install the spool, centering
screw first, into the housing toward the outlet port side of
the housing [C].
With the centering screw toward the front it makes neutral
adjustment easier.
Push the piston through the housing just far enough to
install the new seal over the O–ring [D].
Carefully push the piston back into the housing.
Revised June 96
A
B
C
D
CD–00107
2 1 1 2 3
CD–00108
CD–00087
CD–00086
853, 853H BICS Loader
–3–49– Service Manual