101-B00 Page 13/16
11. Grease the outer edge of a new oil seal (104 or 104A)
and press the flat side of the seal into the inside face of
the closure plate (114).
12. Place the closure plate (114) and a new gasket (115) on
the gearbox assembly cover. Install and torque the
closure plate capscrews (116) as indicated in Table 2.
13. On HRB-GX reducer models, attach the blind closure
plate gasket (119A) and closure plate (119) to the cover.
Install and torque the closure plate capscrews (116) as
indicated in Table 2.
14. On HRO-GX reducer models, install the remaining two
cover capscrews (112A); torque to 30 lbs ft (40.6 Nm)
15. Refill the gear reducer with oil following the procedures
provided in the “Gear Reducer Lubrication” section.
Ref
No.
Pump
Model
Reducer
Model
Torque
lbs ft (Nm)
GX2, GX2.5 HRO-GX 30 (40.6)
116 GX3 HRA-GX 5 (6.8)
GX4 HRB-GX 10 (13.6)
Table 2
PUMP TROUBLESHOOTING
NOTICE:
Maintenance shall be performed by qualified technicians only,
following the appropriate procedures and warnings as presented in this manual.
Symptom Probable Cause
Pump Not Priming
1. Pump not wetted.
2. Worn vanes
3. Suction valve closed.
4. Air leaks in the suction line.
5. Strainer clogged.
6. Suction line or valves clogged or too restrictive.
7. Pump vapor-locked.
8. Pump speed too low for priming.
9. Relief valve partially open, worn or not seating properly.
Reduced Capacity
1. Pump speed too low.
2. Suction valves not fully open.
3. Air leaks in the suction line.
4. Excessive restriction in the suction line (undersized piping, too many elbows & fittings, clogged
strainer, etc.).
5. Damaged or worn parts.
6. Excessive restriction in discharge line causing partial flow through the relief valve.
7. Relief Valve worn, set too low, or not seating properly.
8. Vanes installed incorrectly (see "Vane Replacement").
Noise
1. Excessive vacuum on the pump due to:
a. Undersized or restricted fittings in the suction line.
b. Pump speed too fast for the viscosity or volatility of the liquid.
c. Pump too far from fluid source.
2. Running the pump for extended periods with a closed discharge line.
3. Pump not securely mounted.
4. Bearings worn or damaged.
5. Vibration from improperly anchored piping.
6. Bent shaft, or drive coupling misaligned.
7. Excessively worn rotor.
8. Malfunctioning valve in the system.
9. Relief valve setting too low.
10. Damaged vanes (see following category).
11. Vanes installed incorrectly (see "Vane Replacement").
Damaged Vanes
1. Foreign objects entering the pump.
2. Running the pump dry for extended periods of time.
3. Cavitation.
4. Viscosity too high for the vanes and/or the pump speed.
5. Incompatibility with the liquids pumped.
6. Excessive heat.
7. Worn or bent push rods, or worn push rod holes.
8. Settled or solidified material in the pump at start-up.
9. Hydraulic hammer - pressure spikes.
10. Vanes installed incorrectly (see"Vane Replacement").
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