Eco GA Series, Installation, Operation & Maintenance Manual, Page: 12 / 59

12
F. Pump Internals
Reference Drawings SD-2537, SD-2538, SO 2613, SD-2775
1. After removing the mechanical seal assembly, if it is necessary to either inspect
or repair the pump internals, remove the pump housing bolts and rear housing
(Item 3).
2. The gears (Items 6, 7) and wear plates (Item 15) are now accessible and can
readily be removed along with the drive and idler $hafts (Items 4, 5) from the
center/front housings (Items 2, 1).
3. The gears can be removed from the shafts by removing one of the retaining rings
and sliding the gears off their respective shafts.
4. Inspect all parts for signs of wear or damage. The maximum diametral clearance
(bearing I.D. - shaft O.D.) that is acceptable is .010 inches. Shafts and bearings
that are scored or worn must be replaced. Gears and wear plates with excessive
wear or scoring must also be replaced.
5. Clean all parts before reassembly.
5.3 REASSEMBLY
A. Pump Internals
It is recommended that an Eco KOPkit be used when repairing a pump. The KOPkit
comes with gears already assembled to the shafts and significantly reduces the repair
time. If a KOPkit is being used proceed to Step 2.
1. Install the drive and idler gear (Items 6, 7) onto their respective shafts (Items 4, 5)
using keys (Items 8, 9) and retaining rings (Items 10, 11). Take care not to scratch
the shafts when installing the rings. Check the ends of the rings for sharp burrs. If a
plastic and metal gear set are being used, the plastic gear is always the idler gear.
2. Install new bearings (Items 12, 13) in both the front and rear housing. Make sure that
bearing lock pins (Item 14) are installed on each bearing.
3. Install (2) new O-rings (Item 16) in the groove on each side of the center housing.
4. Install a pair of wear plates (Item 15) on the front housing. Bring the front and center
housing together with the (2) housing pins (Item 17) installed in their location holes.
5. Install the drive and idler gear shaft assemblies into the center/front housings
assembly.
6. Install a pair of wear plates (Item 15) into the rear housing and assemble the rear
housing to the pump along with (2) more housing pins.
7. Install the 4 housing bolts and nuts and tighten.
B. Single Internal Mechanical Seal (G2, G4, G6, G8)
Reference Drawings SD-2537, SD-2538
1. Prior to installation of new seal, clean seal housing (Item 30) and shaft. Burrs, etc.
on shaft may damage the TFE wedge when passing over the shaft.
2. Lightly coat seal head face and I.D. with oil or TFE spray and carefully slip over shaft
and into seal housing with the face end out.
3. If using a refurbished seal seat (Item 55), install new TFE )-ring (Item 55A) and pass
over shaft, pushing seal head (Item 60) in front of it until inboard side of O-ring
groove in seal seat (Item 55) comes flush with end of seal housing (Item 30)
4. Carefully tighten seal head set screws through pipe plug port in seal housing, taking
up on each gradually while rotating shaft.
5. Reinstall gland nut (Item 36) and tighten, thereby compressing seal seat surface
against spring loaded seal face.
6. Tighten gland nut and gland lock nut (Item 35).
C. Single Internal Mechanical Seal (GH8, GA12, GA16)