Pulsafeeder PULSAR 25HL User Manual

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Figure 21 Figure 22
7.7.1 General Description
The piston seals are of carbon graphite reinforced TFE U-cup construction with a stainless steel
energizer spring. The seal is mounted two different ways: on the piston (for the larger piston
sizes – Figure 22) or in the cylinder (for the smaller piston sizes – Figure 21). With oil changes
at recommended intervals, piston seals should give years of service.
7.7.2 Removal
Use the following procedure to remove the Piston Seal:
1. Remove the reagent head and diaphragm.
2. Remove the four bolts that secure the pump head to the eccentric box and withdraw the
pump head. Take care not to lose the oval gasket and the o-ring on the face of the
eccentric box.
3. For larger piston sizes (seal installed on piston), withdraw the crosshead/piston assembly
from the eccentric box. Unscrew the piston from the crosshead and remove the socket
head caps crew inside the piston, withdraw the front of the piston, and remove the large
seal.
4. For smaller piston sizes (seal installed in cylinder), unscrew the seal retaining nut from the
cylinder and withdraw the seal from the counterbore.
7.7.3 Reinstallation
Reinstallation is the reverse of removal. In the case of the larger piston sizes (seal installed on
piston), it is important to apply an anaerobic thread-locking compound to the threads of the
piston-crosshead connection and the capscrew to prevent loosening during operation. Apply
PULSAlube 7H hydraulic oil to seals prior in installation to facilitate assembly and for startup.
Fill the eccentric box with PULSAlube 7H hydraulic oil and prime the pump head.
7.8 OIL SEALS
7.8.1 General Description
The pump has three oil seals as follows:
Motor Adapter Seal
–
Inside the motor adapter, below the worm shaft coupling.
Gearbox Oil Seal
–
Inside the end play adjustment cap on the side of the gearbox.
Eccentric Box Seal
–
Surrounding the eccentric shaft, where it protrudes from the box.
7.8.2 Removal and Replacement
Use the following procedure to remove and replace the motor adaptor seal:
1. Remove the motor.
2. Loosen the coupling setscrew through the access plug hole in the motor adapter and
remove the worm coupling half.
3. Remove the four motor adapter bolts and withdraw the motor adapter from the gearbox.
Take care not to lose the shims from between motor adapter and gearbox.

Pulsafeeder PULSAR 25HL Specifications

General

Brand	Pulsafeeder
Model	PULSAR 25HL
Category	Water Pump
Language	English