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(20,21). Unscrew and remove the foot valve cage along with
the wave washer (21,16) from the foot valve housing.
7. Remove the PTFE o-ring (3), foot valve ball (17,18), foot
valve seat (18,19), and seat o-ring (19,20) from the foot valve
housing (20,21).
8. Remove the o-ring (15) from the pump cylinder (14)
Reassembling the Fluid Section
i
Use PTFE tape on all threaded pipe connections.
1. Place a new seat o-ring (19,20) into the groove in the bottom
of the foot valve housing (20,21).
2. Inspect the foot valve seat (18,19) for wear. If one side is worn,
flip the seat to the unused side. If both sides are worn, install a
new seat. Place the new or flipped seat (worn side down) into
the bore at the bottom of the foot valve housing (20,21).
3. Place a new foot valve ball (17,18) onto the foot valve seat
(18,19). Using a 1/2" extension bar attached to a 1/2" drive
ratchet, insert the end of the extension bar into the square
opening of the foot valve cage (16,17) and screw the foot
valve cage into the foot valve housing (20,21). Torque the
cage to 240 in./lbs. (20 ft./lbs.).
4. Place the wave washer (21, 16) on top of the foot valve cage
(16,17).
5. Insert a new PTFE o-ring (3) into the groove of the foot valve
housing (20,21). Lubricate the o-ring using oil or grease.
6. After soaking the leather packings in oil (preferably linseed
oil), reassemble the lower packing set (4). Place the set onto
the outlet valve housing (13) with the peak of the "V" packings
pointing down toward the hex on the outlet valve housing.
All leather packings must be soaked in CoolFlo
i
hydraulic oil for 15–20 minutes before installation.
Soaking the packings too long will cause the
packings to swell and create difficulty during
reassembly.
7. Inspect the outlet valve seat (11) for wear. If one side is worn,
flip the seat to the unused side. If both sides are worn, use
a new seat. Insert the outlet valve cage (9, PT6900/PT8900/
PT12000) outlet valve ball (10), new or flipped seat (worn
side away from ball), and a new seal washer (12) into the
displacement rod (6).
8. Clean the threads on the outlet valve housing (13) and coat
the threads with blue Loctite #242. Make sure the Loctite is
only on the threads.
9. Place the lower packing spring (9,8) onto the outlet valve
housing (13) followed by the sleeve (8, PT4900 only) and
spring retainer (7, PT4900 only).
10. Screw the displacement rod (6) and the outlet valve housing
(13) together. Tighten in a vise to 600 in./lbs. (50 ft./lbs.).
11. Insert the PTFE o-ring (3) into the upper grove of the motor/
pump block.
12. Insert the upper packing set (4) into the motor/pump block
with the peak of the "V" packings pointing up toward the
motor.
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The packings must be soaked in CoolFlo hydraulic oil
before installation.
13. Place the upper packing spring (5) into the motor/pump block
with the small tapered end facing up toward the motor/pump
block.
14. Insert the displacement rod (6) up through the upper packings
in the motor/pump block.
15. Align the holes in the displacement rod (6) and the hydraulic
piston rod and insert the connecting pin (2). Replace the
retaining ring (1) over the connecting pin.
PowrTwin Plus
GB
16. Orient the cylinder (14) with the knurled portion and removal
nut at the top, thread into the block and tighten with a strap
wrench.
The removal nut (23) must be kept bottomed out
on the threads after the cylinder is tight. Do not
use the nut to jam against the block or damage will
Attention
occur during use. This nut is to be used to help with
removing the cylinder only.
17. Place the o-ring (15) onto the top groove of the pump cylinder
(14).
18. Thread the foot valve housing (20,21) onto the pump cylinder
(14), tighten with a strap wrench and then back off to align the
siphon hose.
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It is not necessary to over-tighten the foot valve
housing. O-ring seals perform sealing function
without excessive tightening. Full thread
engagement is sufficient. The foot valve housing
may be rotated backward up to 1/2 turn from full
engagement for convenient hose position.
For siphon hose attachment, it is critically important
that the threads of the siphon hose fit snugly into
the foot valve housing with the hose assembly
couplings PTFE taped and sealed to prevent air
leakage.
Fluid Section Cut-Away
Peaks of upper
packings must
face up.
Torque outlet
valve housing
to 50 ft./lbs.
(68 Nm).
Use blue
Loctite.
11
Maintenance
Oil cup area
for piston lube
packing
lubricant.
Peaks of lower
packings must
face down.
Lubricate O-ring.
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