Evoqua H30 User manual

MAINTENANCE MANUAL
CIRCULAR
COLLECTOR
H DRIVE
MAINTENNACE
MANUAL
Revision: Manual .081
12/22

MAINTENANCE
.081/02-15 3-0
ITEM PAGE
SAFETY PRECAUTIONS 1-1
H-DRIVE 1-4
GENERAL PRECAUTIONS 1-5
RECOMMENDED LITHIUM BASED GREASE 1-5
LUBRICATION SUMMARY 1-6
ROUTINE MAINTENANCE 1-7
TROUBLESHOOTING GUIDE 1-16
H-DRIVE BEARING CHECK POINTS 1-17

MAINTENANCE
.081/02-15 3-1
CIRCULAR COLLECTOR, H-DRIVE
SAFETY PRECAUTIONS
The primary hazards associated with maintaining circular collectors are identified below.
POWER SOURCE LOCK-OUT
Failure to lock out all sources of power during maintenance
procedures may result in serious personal injury. Following
are the steps of a typical lock-out procedure that can be used
by maintenance and repair crews:
1. Alert the operator and supervisor.
2. Identify all sources of residual energy.
3. Before starting work, place padlocks on the switch, lever or valve, locking it in the
"off' position, installing tags at such locations to indicate maintenance in progress.
4. Insure that all power sources are off and “bleed off” hydraulic or pneumatic pressure
or “bleed off” any electrical current (capacitance) as required, so machine
components will not accidentally move.
5. Test operator controls.
6. After maintenance is completed, all machine safeguards that were removed should
be replaced, secured and checked to be sure they are functioning properly.
7. Only after ascertaining that the machine is ready to perform safely should padlocks
be removed and the machine cleared for operation.
(From Concepts and Techniques of Machine Safeguarding, 1980; U.S. Dept. of Labor OSHA).
TORQUE OVERLOAD CONTROL BOX
Electrical circuits may be energized in the torque overload control box
even though the main power is off. Always check for live contacts
before making adjustments within the box.

MAINTENANCE
.081/02-15 1-2
CHAIN GUARDS
Guards cover several points on circular collectors to prevent personal
injury from moving parts. If guards must be removed during
maintenance procedures, use caution when operating equipment and
replace guards when maintenance has been completed.
OPERATING ENVIRONMENT
Circular collectors are usually exposed to the elements. The bridge
and other access points may become slippery when wet or icy.
Handrails and other safeguards must be in place when working on the
equipment. Use care when access is necessary. Do not work outside
of the bridge handrails. Wipe up grease and oil spills.
The access area for drive maintenance is below the bridge deck
level. The difference in level will depend on the bridge design. A
falling hazard exists. Use caution when in or near the access area.
VENTILATION
Noxious fumes can be generated by septic sewage. Provide forced
ventilation and exhaust facilities when workmen are in a drained tank.

MAINTENANCE
.081/02-15 1-3
FIRE
Torch cutting, welding and the use of solvents present fire hazards.
Use care in these operations and provide fire control equipment in the
working area.
NOTE: If field painting or touch-up is required, refer to "Drive Unit Protection for
Blast Cleaning" in the INSTALLATION section.

MAINTENANCE
.081/02-15 1-4
H-DRIVE
Figure 12
VENT/FILL
PLUG

MAINTENANCE
.081/02-15 1-5
GENERAL PRECAUTIONS
To obtain maximum equipment life, it is necessary to perform the preventive
maintenance services outlined in this section. Maintenance recommendations are a guide
for average operating conditions. Conditions which impose greater wear, loads or strain
on the equipment may dictate increased maintenance. If needed, develop a revised
schedule for site specific requirements. Refer to the manufacturers' bulletins for
equipment not manufactured by Evoqua. These instructions take precedence over those
in this manual should any discrepancy be noted.
The maintenance instructions incorporated throughout this manual are to be used
by qualified service personnel only. Do not attempt to adjust or repair any
components without thorough knowledge of this equipment. Read this manual
completely. Practice preventive maintenance.
RECOMMENDED LITHIUM BASED GREASE
Any major brand of Lithium based grease No. 2 is recommended unless other lubricants
are defined for specific applications in the INSTALLATION or MAINTENANCE
sections of this manual.
For vendor supplied components (i.e. reducer, motor, etc.), see VENDOR
INFORMATION section of this manual for suggested lubricant type and frequency.

MAINTENANCE
.081/02-15 1-6
LUBRICATION SUMMARY
Recommended lubricants for Evoqua upper housing (worm gear section of main drive)
and lower housing (final section of main drive):
SUMMER: 40 F. (4 C.) or higher - Mobil Co. Mobil SHC-630* or equal
WINTER: 40 F. (4 C.) or lower - Mobil Co. Mobil SHC-629** or equal
Recommended lubricants for the primary reducer are in their bulletin in the VENDOR
INFORMATION section of this manual.
Evoqua Approximate Approximate
Drive Oil Capacity Oil Capacity
Size Upper Housing Lower Housing
(Worm Gear) (Final Drive)
H30 LT & HT 3-1/2 Qts. (3.3 Ltr.) 5 Qts. (4.7 Ltr.)
H30A LT & HT 3-1/2 Qts. (3.3 Ltr.) 6 Qts. (5.6 Ltr.)
H40 LT & HT 5 Qts. (4.7 Ltr.) 4 Qts. (3.7 Ltr.)
H40A LT & HT 5 Qts. (4.7 Ltr.) 8-1/2 Qts. (8 Ltr.)
H40 HD 10-1/2 Qts. (9.9 Ltr.) 4 Qts. (3.7 Ltr.)
H60 LT & HT 6 Qts. (5.6 Ltr.) 5 Qts. (4.7 Ltr.)
H60A LT & HT 6 Qts. (5.6 Ltr.) 16 Qts. (15.1 Ltr.)
H60A HD 12 Qts. (11.3 Ltr.) 16 Qts. (15.1 Ltr.)
H80 LT & HT 6 Qts. (5.6 Ltr.) 10 Qts. (9.4 Ltr.)
H80A LT & HT 6 Qts. (5.6 Ltr.) 16 Qts. (15.1 Ltr.)
H90 LT & HT 13 Qts. (12.3 Ltr.) 19 Qts. (17.9 Ltr.)
HD90 (2 Upper 13 Qts. (12.3 Ltr.) 19 Qts. (17.9 Ltr.)
Housings and 1 (each) Upper
Lower Housing) Housing
H90A LT & HT 13 Qts. (12.3 Ltr.) 24 Qts. (22.7 Ltr.)
HD90A (2 Upper 13 Qts. (12.3 Ltr.) 24 Qts. (22.7 Ltr.)
Housings and 1 (each) Upper
Lower Housing) Housing
NOTE: Due to the viscosity of the oil, it can take several hours for a true reading
to occur at the sight gauge. Overfilling of oil will result in oil leaking into
the collector.
*Viscosity 1045/1165 SUS @ 100 F. (38 C.) ISO Viscosity Grade 220
**Viscosity: 710/790 SUS @ 100 F. (38 C.) ISO Viscosity Grade 150

MAINTENANCE
.081/02-15 1-7
ROUTINE MAINTENANCE
*Or after severe weather or wash-down procedures.
**Due to the viscosity of the oil, it can take several hours for a true reading to occur at
the sight gauge. Overfilling of oil will result in oil leaking into the collector.
D - Daily W - Weekly M - Monthly SA - Semi-Annually
ITEM DESCRIPTION INTERVAL
SURFACE
SKIMMER
Check for smooth action on scum beach and re-entry
into tank. Check for binding against scum baffle.
During winter months, when icicng becomes
prevalent, place skimmer in lock-out positon.
D
Hose off the skimmer assembly and inspect. Tighten
all loose connections, adjust for proper skimmer
assembly blade submergence (3"(76mm) below
maximum water surface or as indicated on the
General Arrangement Drawings.). The spring loaded
hinged guide should just contact the inner wall of
the scum beach.
SA
Replace any lost or worn parts such as neoprene
wiper, polywear block or springs, if necessary
SA
WORM GEAR
SUBASSEMBLY
Check oil level at sight gauge located on side of
worm gear housing.
W*
If low, check for leaking shaft seals at worm shaft
near sprockets or remove torque overload housing
cover and inspect inside for oil Replace seals as
required. Add oil to proper level.**
If high, check for evidence of condenstae (water) in
oil. Drain small amount of oil from housing and
inspect. If clear water is present, drain until oil is
draining. Refill to sight gauge wih proper grade of
oil.** Check for damaged gasket, air vent, loose or
missing cover bolts.

MAINTENANCE
.081/02-15 1-8
ITEM DESCRIPTION INTERVAL
WORM GEAR
SUB-ASSSEMBY
(Continued)
Inspect and clean, if necessary, worm gear housing air
vent.
M
Grease worm gear bearing with a Lithium based #2
grease. Two fittings are located over worm gear on
top of housing.Clean fittings, add approximately two
pumps from grease gun to each fitting.
M
Check condition of oil for condensate or other
contaminants by draining a small amount and visual
inspection.
M
If clear water is present, drain until oil becomes
present and refill oil to proper level.** Check for
damaged gasket, air vent, loose or missing cover
bolts.
If oil is milky in color, drain, flush and refill with
fresh oil.** Check for damaged gasket, air vent,
loose or missing cover bolts.
If metal contaminants are present, remove chain
guard, chain, primary gear reducer and worm gear
housing cover and inspect for damaged or worn
parts. Flush, per procedure at end of this section,
and clean housing, replace parts as necessay,
reassemble. Add oil to proper level.**
**Due to the viscosity of the oil, it can take several hours for a true reading to occur at
the sight gauge. Overfilling of oil will result in oil leaking into the collector.
D - Daily W - Weekly M - Monthly SA - Semi-Annually

MAINTENANCE
.081/02-15 1-9
ITEM DESCRIPTION INTERVAL
WORM GEAR
SUBASSEMBLY
(Continued)
Seasonal change of oil SA
In preparation for changing the oil, drain out
approximately 5% (1quart) and replace with Mobil
Oil Corp. Mobil System Cleaner. Run the drive unit
at minimum load condition (reduce sludge blanket)
for approximately 48 hours. Shut off drive unit and
rain. Replace with oil with proper viscosity for
anticipated seasonal conditions.
Summer: Mobil SHC-630
Winter: Mobil SHC-629
Drain by removing plug in street elbow located
in underside of worm gear housing.
Air vent/filler plug is located in cover plate.
TORQUE
OVERLOAD
SWITCHES
Remove cover and inspect inside of housing for signs
of condensate or oil.
SA
Inspect switches for signs of corrosion. Trip
microswitch by placing screw driver in gap to verify
alarm/shut-off systems are functional. Review
warnings listed on next page.
**Due to the viscosity of the oil, it can take several hours for a true reading to occur at
the sight gauge. Overfilling of oil will result in oil leaking into the collector.
D - Daily W - Weekly M - Monthly SA - Semi-Annually

MAINTENANCE
.081/02-15 1-10
ITEM DESCRIPTION INTERVAL
TORQUE
OVERLOAD
SWITCHES
(Continued)
DO NOT ADJUST GAPS WITHOUT
CONSULTING FACTORY. Gap settings can only
be verified after residual load against spring plate has
been neutralized. This can be accomplished by
draining the tank and removing any impediments or
if draining is not possible, then by removing motor
and rotating the input shaft of the primary reducer,
releasing tension on drive chain. Continue to rotate
input shaft until final gear starts to move opposite of
normal rotation. Stop. Further rotation of input shaft
will cause damage. Gap settings are indicated on the
inside of the torque overload housing cover or on the
General Arrangement Specification Drawing.
WARNING: DO NOT OPERATE DRIVE IN THE
REVERSE ROTATION. Torque overload switches
are NOT operative during reverse rotation. Severe
damage can occur to mechanism's structure and drive
unit. Use reversing switch, if furnished, only for
momentary jog to dislodge the rake arm from
hang-up or to unload the drive unit.
DRIVE CHAIN
SPROCKETS
Check for loose bolts, setscrews or keys. If necessary,
retorque to the correct torque value. Check teeth for
wear. Replace when tooth wear presents an
observable hooked profile.
M
DRIVE CHAIN Check chain for excessive slack. Shift primary gear
reducer or remove link when required. Check
sprocket alignment by placing a straight edge across
the machined surfaces of the sprockets. Check chain
for wear.
M
D - Daily W - Weekly M - Monthly SA - Semi-Annually

MAINTENANCE
.081/02-15 1-11
ITEM DESCRIPTION INTERVAL
SHEAR PIN
SPROCKET
Grease fitting located on hub of shear pin sprocket.
Check safety collar. Check for loose setscrews or
loose key. Check teeth for wear. Replace when tooth
wear presents an observable hooked profile.
M
Remove chain and shear pin. Rotate hub to expose
shear faces. Clean faces and swab with Lithium based
#2 grease. Reassemble pin and chain.
SA
CAUTION: When reinstalling shear pin, necked
down portion must be aligned in the shear plane.
FINAL DRIVE
ASSEMBLY
Check oil level at sight gauge located under floor
plate cover. Final gear/oil condensate drain is the
1-1/2" (38 mm) ball valve located below sight gauge.
Pinion oil/condensate drain is the 3/8" (10 mm) ball
valve located at the pinion bearing hub. NOTE:
Condensate can accumulate at all drain points,
therefore, both final gear and pinion drains must be
checked.
D*
If low, check for leaks in oil or condensate drain
piping and final drive housing. Add oil to proper
level.**
If high, check for evidence of condensate (water)
in oil. Drain small amount of oil through the oil
and condensate drain valves and inspect. If clear
water is present, drain until oil is draining. Refill
to sight gauge with proper grade of oil.** Check
for loose or damaged dust shield.
*Or after severe weather or wash-down procedures.
**Due to the viscosity of the oil, it can take several hours for a true reading to occur at
the sight gauge. Overfilling of oil will result in oil leaking into the collector.
D - Daily W - Weekly M - Monthly SA - Semi-Annually

MAINTENANCE
.081/02-15 1-12
ITEM DESCRIPTION INTERVAL
FINAL DRIVE
ASSEMBLY
(Continued)
Check condition of oil for condensate or other
contaminants by draining a small amount from both
oil and condensate drains and visual inspection.
M*
If clear water is present, drain until oil
becomes present and refill oil to proper
level.**
Check for damaged dust shield.
If oil is milky in color, drain, flush and refill
** with fresh oil.Check for damaged dust
shield.
Some metal contaminants (fine particles,visual
with the eye) are expected in the first six to
twelve months of service due to initial groove
formation of bearing races. If contaminates are
high in concentration or if large metallic chips
are present, take clarifier out of service. After
locking out drive starter, inspect stop blocks by
pulling back edge of neoprene drive dust
seal.If bottoms of stop blocks show signs of
contact with the top portion of the main gear or
if a stop block is missing, CALL FACTORY.
Seasonal change of oil. SA
*Or after severe weather or wash-down procedures.
**Due to the viscosity of the oil, it can take several hours for a true reading to occur at
the sight gauge. Overfilling of oil will result in oil leaking into the collector.
D - Daily W - Weekly M - Monthly SA - Semi-Annually

MAINTENANCE
.081/02-15 1-13
ITEM DESCRIPTION INTERVAL
FINAL DRIVE
ASSEMBLY
(Continued)
In preparation for changing the oil, drain out
approximately 5% (1 quart) and replace with
Mobil Oil Corp. Mobil System Cleaner. Run the
drive unit at minimum load condition (reduce sludge
blanket) for approximately 48 hours. Shut off drive
unit and. drain. Replace with oil with proper
viscosity for anticipated seasonal conditions.**
Summer: Mobil SHC-630
Winter: Mobil SHC-629
Drain by opening 1-1/2" (38 mm) ball valve located
under floor plate cover. Also, drain each condensate
line.
Filler plug is located in elbowed pipe located in
pinion hub.
Check bearing race wear. Every third annual
clarifier shut-down, lock out drive starter, inspect
final drive stop blocks by pulling back edge of
neoprene drive dustseal.. Please refer to "H-Drive
Bearing Check Points" page at the end of this
section.
Three
Years
MOTOR Refer to manufacturer's bulletins in VENDOR
INFORMATION section.
M
PRIMARY
REDUCER
Refer to manufacturer's bulletins in VENDOR
INFORMATION section.
M
**Due to the viscosity of the oil, it can take several hours for a true reading to occur at
the sight gauge. Overfilling of oil will result in oil leaking into the collector.
D - Daily W - Weekly M - Monthly SA - Semi-Annually

MAINTENANCE
.081/02-15 1-14
ITEM DESCRIPTION INTERVAL
BRIDGE
COMPONENTS
Check for and tighten any loose fasteners per the
Fastener Installation Instructions. Special attention
should be given to locating loose handrail and/or
grating/floor plate connections.
M
NOTE: Inspect and verify bridge base plate
expansion connection is free to allow movement for
the thermal expansion/contraction of the bridge
structure.
SCUM TROUGH,
SCUM BAFFLES,
WEIRS
Before tank drain-down, inspect weirs for consistent
water depth. Inspect one full rotation of skimmer
assembly, checking if any binding occurs. At tank
drain-down, hose off all components. Make any
necessary adjustments. Replace and tighten any
missing or loose bolts. Any mastic sealer or grouting
that has cracked or come loose should be replaced.
SA
SCRAPER ARMS When tank is drained for semi-annual inspection,
remove all slime or sludge with a high pressure hose.
SA
Examine all bolted connections for loose or missing
bolts or shims. Tighten and replace as necessary
Inspect plow blades and squeegees. Replace any that
are missing, badly bent or worn.
D - Daily W - Weekly M - Monthly SA - Semi-Annually

MAINTENANCE
.081/02-15 1-15
ITEM DESCRIPTION INTERVAL
OIL FLUSHING
PROCEDURE FOR
EVOQUA
INTERMEDIATE
AND FINAL
HOUSINGS ONLY
Reduce loading on clarifier mechanism by lowering
sludge blanket as a minimum. It is preferred to drain
and clean tank. Stop and lock out drive motor. Drain
existing oil. Refill with a mixture of 50% Mobil Oil
Corp. Mobil System Cleaner and 50% of any gear
lube oil. Run unit for 4 hours. Stop and drain. Refill
with proper viscosity oil for anticipated weather.**
As
Required
For other gear reducers, see manufacturer's bulletins
in VENDOR INFORMATION section.
**Due to the viscosity of the oil, it can take several hours for a true reading to occur at
the sight gauge. Overfilling of oil will result in oil leaking into the collector.
D - Daily W - Weekly M - Monthly SA - Semi-Annually

MAINTENANCE
.081/02-15 1-16
TROUBLESHOOTING GUIDE
PROBLEM POSSIBLE CAUSE CORRECTIVE ACTION
DRIVE OVERHEATING
Oil level too low.
Oil level too high.
Fill to correct level.
Check for condensation or
water present in oil
reservoirs.
Low oil level in high speed
gear case.
Fill to proper level.
BROKEN SHEAR PINS
OR ALARM BEING SET
OFF
Solids build-up in tank Drain tank and clean.
Large debris in tank Drain tank and remove.
Grout on tank floor raised. Drain tank, repair floor and
regrout.
Damaged/missing stop
blocks.
Refer to H-Drive Bearing
check poin sheet.
Scraper making contact
with tank floor.
Drain tank and adjust
properly. Check for proper
retaion of scraper for
correct clearance.
Bridge being locked down. Loosen and check
expansion slots for
movement.
SKIMMER NOT
SKIMMING PROPERLY
Blade not adjusted correctly Adjust blade so it makes
full contact with beach.
Build-up of material on
beach.
Clean and remove fibrous
material.

MAINTENANCE
.081/02-15 1-17
H-DRIVE BEARING CHECK POINTS
DRIVE BALL
DIAMETER
STOP
BLOCK
GAP
MAXIMUM
STOP
BLOCK GAP
GEAR /
HOUSING
CLEARANCE
H30, H30A 1.00”
25.4 mm
0.07”
1.778 mm
.225”
5.715 mm
0.25”
6.35 mm
H40, H40A, H40HD 1.00”
25.4 mm
0.07”
1.778 mm
.225”
5.715 mm
0.25”
6.35 mm
H60, H60A,
H60HD, H60AHD
1.25”
31.74 mm
0.093”
2.362 mm
.225”
5.715 mm
0.25”
6.35 mm
H80, H80A, H90, H90A,
HD90, HD90A
1.50”
38.1 mm
0.093”
2.362 mm
.225”
5.715 mm
0.25”
6.35 mm
Notes:
1. When stop block gap approaches 0.200" (5.08 mm), replacement of strip liners is
suggested
2. If stop block gap reaches the maximum allowable gap indicated, drive rebuild is
recommended.
3. If top of main gear and under side of stop blocks are scored or worn, a detailed
inspection of the drive mechanism by an Evoqua Field Technician is recommended.
4. If a stop block is missing, STOP the drive immediately, and contact sales
representative or Evoqua Field Service Manager.