Eco GA Series, Installation, Operation & Maintenance Manual, Page: 13 / 59

13
Reference Drawing SD-2613, SD-2775
1. Before replacing seat assembly, lubricate seal ring with lightweight machine oil or
other lubricant compatible with pumped fluid. Then carefully align slot in seal seat
(Item 55) with seat retainer pin. Place protective material over polished seal seat
surface and press seal seat into seat retainer (Item 36).
2. To reassemble, install seal head (Item 60) on drive shaft and remove holding clips.
Adjust seal head so that seal face is approximately 145 inches back from the front
surface of the front housing on GA12/16 models. On GH8 model center set screw on
seal head in pipe plug port.
3. Tighten seal head set screws through tapped port. Replace pipe plug (Item 62 or 63).
4. Assemble seat retainer (Item 36) with seal seat installed and a new seat retainer O-
ring (Item 55A) over drive shaft (Item 4).
5. Tighten seat retainer bolts (Item 39A) which will set proper compression on seal
head.
D. Single External Mechanical Seal (G2, G4, G6, G8)
Reference Drawing SD-2537, SD-2538
1. Prior to installation of either refurbished or new seal parts, clean housing and shaft.
Remove any buns or buildup which could damage TFE wedge. Make sure there are
no sharp edges on end of shaft or on shaft flat.
2. If using refurbished seal seat install with a new TFE O-ring, and slide over shaft into
the front housing (Item 1) with the lapped side facing out.
3. Screw on gland nut (Item 36) to position seat and tighten.
4. Tighten gland lock nut (Item 35)
5. Lightly coat seal head face and I.D. with oil or TFE spray. Carefully and gently, push
seal head over shaft, taking care not to damage TFE wedge or seal face.
6. Pull shaft away from pump as far as built-in end play will allow it, then fully compress
seal head face against seal seat, and then back off seal head until 1/32" of seal face
becomes visible. Tighten seal head set screws securely.
E. Double Mechanical Seal (G2, G4, G6, G8)
Reference Drawing SD-2537, SD-2538
1. Install new seal housing gasket (Item 31), screwing it down the front housing hub
until it meets the lock nut.
2. Install new or refurbished pump end seal seat (Item 56) with new O-ring. Slide seal
seat over shaft until O-ring is still visible and has not yet entered front housing (Item
1).
3. For G2 and G4 pumps, replace seal housing (Item 30) and install new or refurbished
seal head (Item 60), making sure set screws are backed out and will not mar shaft.
Do not tighten set screws.
4. For G6 and G8 pumps, install new seal head as above, but prior to replacing seal
housing (Item 30), push seal head against pump end seal seat (Item 56)
compressing seal face as far as it will go. Tighten seal head set screws.
5. Screw seal housing tightly on pump hub, compressing O-ring and locking pump end
seal seat firmly in place.
6. Push seal housing gasket (Item 31) up against recessed bore in seal housing and
tighten lock nut (Item 32).
7. Install new or refurbished drive end seal seat (Item 55) with new seat O-ring.
8. Screw on gland nut (Item 36) and tighten firmly compressing seat O-ring and locking
drive end seal seat in place. Tighten gland lock nut (Item 35).
9. With G2 and G4 pumps, center seal head setscrews with seal housing port and
tighten set screws.
10. Reinstall flush connections.