CLAUSING 5914 - Hydraulic Control Cylinder Replacement; Replacing Upper Variable Control Cylinder; Replacing Lower Variable Control Cylinder

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REPLACING UPPER VARIABLE
CONTROL CYLINDER
l. Start lathe and turn speed control (A, Fig. 25) to top
speed. Stop lathe and remove hydraulic hose (E)
(use container to catch oil).
E
FIGURE 25
2. Loosen the two set screws (C) and remove upper cyl-
inder (D) and rod assembly (G) from housing (F).
3. Insert set screw end of new rod assembly (G) into
housing (F). Hold the rod firmly against cam roller
(H) and turn speed control (A) against low speed
stop.
STRAIGHT EDGE ___ ,
FIGURE 26
4. The end of rod (G) must be flush with face of hous-
ing (F) - use a straightedge to check as shown in
Figure 2 6.
5. Remove rod (G, Fig. 25) from housing (F) and insert
rod into upper cylinder (D) making sure socket set
screw end is exposed.
6. Hold speed control (A) firmly against low speed stop
while mounting upper cylinder (D) against housing
(F) - secure with set screws (C).
IMP.ORT ANT: Upper cylind er assembly must be solidly
against housing face.
7. Inst a ll hydraulic line (E).
8. Fill cylinder with hydraulic oil. Start lathe and turn
speed control to low speed stop and hold. Oil will
drain from reservoir and bleed system. Add oil until
reservo ir is full. Turn speed control to high speed
stop and return to low speed stop. Continue this
cycle adding oil as needed (check sight window)
until system is bled completely .
REPLACING LOWER VARIABLE
CONTROL CYLINDER
l. With lathe running, turn variable speed dial to high·
est range (280 or 2000). Then, turn motor off.
2. Measure distance from end of shaft (J, Fig. 24) to
locknut (H). NOTE: Record th is dimension.
3. Disconnect fitting (K) and drain oil from unit.
4. While holding variable pulley (F) from rotating re•
move locknut (H).
5. Pull dual hydraulic cylinder (G) and outer half of
variable pulley (F) off the shaft (J).
6. Press dual hydraulic cylinder (G) with bearing (L)
from variable pulley (F) .
7. Slide new dual hydraulic cylinder with bearing into
variable pulley hub (F), then slide the assembly
onto sa ft (J ).
8. Start locknut (H) on sh a ft (J).
9- Hold the variable pulley so it will not rotate and
then turn locknut (H) onto shaft (J) until di :ii:~ nce
from the end of the shaft (J) to locknut (H) is the
same as step 2.
10. Start fitting (K) onto hydraulic cylinder (G). NOTE:
Do not tighten .
11. Fill oil reservoir.
12. Keep oil reservoir filled, hold variable dial against
low speed stop - until oil runs out around fitting (K) -
it takes a few minutes for oil to run down.
13. Tighten fitting (K).
14. Start lathe motor. Hold variable control against
low speed s top for 30 seconds - turn variable dial
to highest speed - then back to lowest speed a
few times. Control should stay at 52 rpm.
NOTE: Watch dial for a few seconds. If it doesn ' t re-
main at 52 rpm, the hydraulic system must be bled to
remove trapped air.
To remove air from hydraulic system:
A. Run variable to highest speed.
B. Loosen bleeder screw (D, Fig. 25) a few turns
until oil starts coming out around the screw.
C. Retighten bleeder screw.
D. Turn variable dial to low spee d, stop and re·
lease . - pointer should remain at 52 rpm.
NOTE : If d i.a l moves, repeat steps A, B, .a nd C.
16.2
5910
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