STS M-750H User manual

Surface to Surface Inc. ®
Operators Manual
** M-750H **
USE IN CONJUNCTION WITH OEM MANUALS (ENCLOSED)
Unit Serial No. _______________
Hydraulic Motor
SNM2/19C106 – Serial No.__________________
Gorman-Rupp Pump
GR-84B2 – Serial No. ________________
Control Valve
Brand FC51 Serial No.__________________
Links relating to this Manual
www.stsmixers.com
www.grpumps.com
STS-132 Rev. 09/20/12 www.stsmixers.com
Dealer

2
TABLE OF
CONTENTS
PAGE
STS Inc Warranty………………………………………………………….. 5
Safety Statements………………………………………………...………… 6-9
Safety Markings……………………………………………………………. 10
Hydraulic Connections / Schematic………………………………………. 11
Main Working Components (Photo)……………………………………… 12
Introduction to the M-750H…………….….……….….…………………. 13
M-750H Foot Print (top view)……………………………………………… 14
M-750H General Data Sheet………………………………………………. 15
Identifying Your Machine & Components………………………………. 16
SECTION II (Description, Care and Maintenance)
Polyethylene Plastic Reservoir Tank…………………….…………… 18-19
Hydraulic powered centrifugal pump.…..….…...……..……….……. 20-23
Filter shear system……………………………………………………. 24-25
Venturi mixing tee……………………………..………..……………. 26
Wash wand……………………………………………………...……. 27
Dry hopper with table & hopper valve…………………………..…… 28
Internal tank jet gun…………………………………...……………… 29
SECTION III (Set-up and installation of unit in Detail)
Permanent mounting of unit…………………………...…………….. 31
Portable use of unit…………………….…………………….………. 31

3
TABLE OF
CONTENTS
PAGE
SECTION IV (Operating the M-750 Unit.)
Site set-up and pre-check…………………………………………….. 33
Starting the hydraulic driven pump…….…………….....…………… 34
Typical mixing operation……………………….……………………. 35
Typical transfer / off-loading operation……………………………… 36
Shutdown, cleanup & storage
Warm weather…………………………………….…………. 37
Cold/ freezing weather………………………………….…… 38
Prolonged periods of storage………………………………… 39
**Optional self-loading feature……………………………...………… 40
SECTION V (Trouble shooting)
Trouble Shooting the M-750…………….…………………..……… 42-43
SECTION VI (Periodic Maintenance & Repair Information)
Maintenance Schedule…………………….….………………….…... 45
Centrifugal Trash Pump Seal Replacement………………………..… 46
Bolt torque Specifications…………………………………….……... 47
Notes…………………………………………………….…………… 48

4
TABLE OF
CONTENTS
PAGE
SECTION VII (OEM Repair Information)
GR Centrifugal Pump Owner’s Manual……………………..………… 50-61
Gruvloc® Pipe Couplings……………………….………………..…… 62-64
Sauer Danfoss Hydraulic motor …………..…….….….….….….……. 65-67
SECTION VIII (Parts Manual)
M-750H PARTS MANUAL…………………….……………….……. 69-72

5
Limited Warranty
United States and Canada
Surface to Surface Inc. or it’s subsidiary which last sold the product, warrants new products sold by it for use in the
United States and Canada to be, at the time of manufacture, free from defects in workmanship and materials. This
warranty covers for a period of Twelve (12) Months of operation from the date of delivery for initial use, whichever
comes first.
Exclusions and Additional Limitations
1. This warranty relates to the condition of the product at the time of manufacture and does not cover parts or
service as a result of:
(a) Normal wear and tear or required maintenance including, without limitation, adjustments or replacement of
components subject to wear and tear, such as belts, hoses, seals and/or packing, fuses, bulbs,
switches and ignition parts.
(b) Abuse including, without limitation, neglect, improper operation, misapplication, overloading, accident or
alterations not approved by Surface to Surface Inc.
(c) Lack of maintenance, including, without limitation, failure to inspect and maintain, improper repair, use of
“unapproved parts”, cracked engine heads and blocks unless caused by the failure of
an internally lubricated part or repair of engine valves, rings or guides.
2. The Company’s warranty does not apply to purchased components manufactured by others where separate
warranty is made by the manufacture of such components and will be applied as interpreted by
the supplier.
3. All claims under his warranty shall be submitted in writing by the distributor to the Company, which will be the
sole judge in determining the merits of the claim.
4. The company shall have the right to have all products or parts claimed to be defective returned to it and the
cost of shipping such items shall be borne by the distributor.
……………………………………………………………………………………
Warranty Registration Card
In order to help us provide complete service for our product, please complete this card and return it.
If not returned, all requests for warranty will be denied.
Print Name: …………………………………………………………………….….
Address: …………………………………………………………………………...
City: ……………………State/Province………………Zip/PC…………………...
Model No. ………………………….. Serial No. …………………………………
Date of Purchase ………………………… Dealer ………………………………..
Return to: Surface to Surface Inc.
5150 Forest Rd. RR#3
Watford, Ontario, Canada
N0M 2S0
01/14/08

6
M-750H
SAFETY STATEMENTS
Your personal safety and the safe operation of this unit are the concern of Surface to Surface Inc, and by
reading and understanding this manual and understanding the safety statements, you will decrease the risk of
personal and equipment damage.
Safety statements are listed here and throughout this manual to draw your attention to potential hazards that
may be encountered while operating this piece of equipment. While reading this manual, you will notice that
certain safety statements will relate directly to the operation, or maintenance of that particular part of the unit and
should be followed carefully. Decals on the unit also follow the same format as the warnings in this manual, and
therefore should be kept in good repair to alert the operator and others of the potential hazard.
The engine / motor manual also contains hazard warnings which pertain to the engine / motor and should
also be followed.
This safety alert symbol appears with most safety statements.
It means attention, become alert, your safety is involved!
Please read and abide by the message that follows the safety alert symbol.
DANGER
WARNING CAUTION
CAUTION
Caution "without the safety alert symbol"
indicates an potentially hazardous
situtation that can cause damage to the,
machine, personal property and / or the
environment or cause the machine to
operate improperly.
Danger (the word "DANGER" is in white
letters with a red rectangle behind it)
indicates an imminently hazardous
situation, which, if not avoided, will
result in death or serious injury.
Danger is limited to the most extreme
situations.
Warning (the word "WARNING" is in black
letters with an orange rectangle behind it)
indicates an potentially hazardous
situation which, if not avoided, could
result in death or serious injury.
Caution (the word "CAUTION" is in black
letters with a yellow rectangle behind it)
indicates an potentially hazardous
situation which, if not avoided, may
result in minor or moderate injury.

7
M-750H
SAFETY STATEMENTS
The following caution statements have been drawn from the instructions in this manual. They
have been assembled here for ready reference.
DANGER
IN AN EMERGENCY
rotate the flowcontrol valve
lever to the STOP position
to halt the pump, and fluid flow.
DANGER
NEVER ATTEMPTREPAIRS
OR DISASSEMBLY
without shutting off the hydraulic
power source (customer supplied)
Seriouspersonal injurywill result.
WARNING
while the unit is inoperation.
Serious personal injurywill result.
NEVER ATTEMPT TO REMOVE
OR CLEAN THE FILTER SHEAR
WARNING
Serious personal injurywill result.
DO NOT REMOVE OR MODIFY
SAFETY COVERS OR GUARDS.
CAUTION
DO NOT POSITION
ANY PARTOF YOUR BODY
over the hopper, valve,
or mixing tee while cleaning.
CAUTION
WHEN THE UNIT
IS IN OPERATION,
the fluid in the piping mayreach
pressures upto50 p.s.i.
CAUTION
NEVER OPERATE THE MIXING
unit with the tank lid open.
If viewing is necessary, open
onlythe small inspection
vent cap in the center of the lid.
DANGER
Escaping fluidsunder pressure
canpenetrate the skin causing
serious personal inj uryor death.
HYDRAULIC FLUID UNDER
EXTREAM PRESSURE
WARNING
NEVER USE BODYPARTS,
OR FOREIGN OBJECTS
in an attempt to unplug or clean the
hopper valve or mixing tee.
Serious personal inj uryor
damage will result.

8
M-750H
SAFETY STATEMENTScontinued
The following caution statements have been drawn from the instructions in this manual. They
have been assembled here for ready reference.
CAUTION
TRAPPEDFLUID MAY BE PRESENT
andwill spill out whenpiping, hoses,
pumpor filter shear are removed.
CAUTION
AVOID ALLOWING FOREIGN MATERIAL
into the Venturi MixingTee thruthe
Hopper, bykeepingthe valve closed
whennot in use.
CAUTION
NEVERLEAVE LIQUID INTHE
PUMP CASING, PIPING, OR HOSES
during freezing weather conditions,
as damage will result.
Follow instruction for winterizing.
CAUTION
CAUTION
CARE MUSTBE TAKEN WHEN
INSTALLINGTHE COUPLERGASKETS.
If the gaskets are not properlylubricated
and installed, a leak maydevelop.
IMPROPERINSTALLATIONOFTHE
MECHANICAL or GREASE SEAL
will result inleakage and possible
damage tothe seal. All maintenance,
operating and repair of this unit, must be
done per the instructions in the operators
manual for safetyandreliability.
CAUTION
WHEN TRANSFERRINGFLUID
to the drill rig, fluid pressure may
reach or exceed 50 p.s.i.
CHECK the drill rig manufacturers
specifications regarding maximuminlet
pressures allowed for their pump.
CAUTION
BEFORE STARTING THE HYDRAULIC MOTOR,
BESURETHE PUMP ISPRIMED!
Check the pump byslowly& carefully
opening the pluglocatedon thetop ofthe
centrifugal pumpbeside the discharge elbow.
A visual inspectioncanbe made if thefluid
escapes around the plugas it isloosened.
Remove the plugto viewinsidefluidlevel.
Thecentrifugal pumpseal WILLbe
damaged if allowed to cavitateor rundry.

9
M-750H
SAFETY STATEMENTScontinued
The following caution statements have been drawn from the instructions in this manual. They
have been assembled here for ready reference.
CAUTION
CAUTION
The manufacturer should be consulted
whenconsideringalternative uses
for this piece ofequipment.
This unit was designedfor the mixing
and shearing of a dryadditive, into a
liquid stream.
Other uses maycreate unforeseen safety
issues andpersonal injuryrisk.
CAUTION
BEFORE LIFTINGOR MOVING THE UNIT,
all fluid should be removed from the tank.
CAUTION
AVOID PLACING OBJECTS
on top or against the tank as damage
mayresultfromthe weight.
CAUTION
LIFTING LUGS OR THE LIFTING POINT(S)
identifiedandlabelledonthe skid
structure must be used inorder to
safelylift and transport the unit.
TOENTER THE TANK is not recommended
Personal injurycouldresultfrom
the presents of hazardous fumes,
remaining fluid or unit start-up.
WARNING
RE FE R TO THE S AFE TY
STATEMENTS IN THE
OEM SUPPLIED MANUALS
AND
THIS MANUAL
REGARDINGTHESE
OPERATIONS.

10
M-750H
Safety Markings
Hazard and warning markings have been placed at appropriate points on the unit. International symbols
have been used, in order to ensure universal understanding of the nature of the hazard. Please comply
with all warnings and markings to ensure safe use of the equipment. These include but are not limited to:
a) Lifting points b) Flammable Liquids
c) High temperature areas d) Personal Protection recommendations
e) Personal dangers f) Equipment dangers
g) Operating instructions h) Fluid flow direction
SOME EXAMPLES FOUND ON THE EQUIPMENT
Lifting Point
Personal Protection
,
Read and understand O
p
erator’s manual and Maintenance manual
Hot Surface
Fluid Flow Direction
Maintenance Instructions
Liftin
g
Point
Safet
y
Instructions
KEEP LID CLOSED
W
HILE MIXING
CLEAN FILTER DAILY

11
M-750H
These guidelines must be followed or warranty will be voided. Any variation
needs to be approved by Surface to Surface®.
SET-UP
Minimum Flow Rate: 15.0 us gpm.
Maximum Flow Rate: 16.5 us gpm.
Relief Setting: 2250psi.
Inlet Hose Size: 3/4" minimum
Outlet Hose Size: 3/4" minimum (
direct to reservoir )
Caution:
As the hydraulic oil increases in temperature the hydraulic flow rate will rise
above your set rate of 15.0 – 16.5 g.p.m. of hydraulic flow. The hydraulic flow valve should
then be set back to the recommended flow rate of 15.0 – 16.5 g.p.m.
Specifications on hydraulic oil, operating temperature, and filtration can be found
further on in this manual, on the Sauer Danfoss hydraulic motor data sheets.
Any problems or question may be answered by calling Surface to Surface®at
[phone] during normal business hours.
CF
EF
IN
1
2
3
4
5
6
7
8
9
01-20-06
RETURN LINES
PRESSURE LINES
CUSTOMER SUPPLIED
IN FLOW OUT FLOW
TO TANK
M4-H
16.5 usgpm. MAX.
M-750H

12

13
M-750H
Operators Manual
Congratulations on your acquisition of the time proven M-750 Mixing System. You have acquired the
fastest and most efficient mixing system manufactured for mixing Bentonite drilling slurry (mud). As a
manufacturer of HDD support equipment, we are well aware of the extreme conditions that HDD
equipment is exposed to on a daily basis. Surface To Surface Inc. strives to overcome these conditions,
with better design and manufacturing practices. Please feel free to call our toll free number
(1-800-567-0978) if you have any questions or concerns about your M-750.
Thank you, for choosing the M-750 series mixer.
The M-750 mixing unit was designed to mix dry or liquid drilling products with clean
water, into a slurry. The slurry is continually circulated through the mixing cycle until it
reaches the desired consistency. The operator can then transfer the final product to a holding
reservoir or directly to the drilling equipment.
The M-750 mixing unit consists of a 750 u.s. gal. (2839 litre) polyethylene plastic tank,
hydraulic powered centrifugal pump, filter/shear unit, venturi mixing tee assembly, dry
hopper with a table, tank internal jet gun and a discharge valve to pump the finished slurry
to a holding tank or the drill rig. These components are all mounted on a frame type skid,
built for lifting or solid mounting. For ease of interpretation, looking at the mixing unit
hopper straight on will be considered looking at the front of the unit. Hence the other long
side, will be the rear and the ends will be right or left end.
RECORD OF OWNERSHIP:
Unit Serial No. __________________________________________
Motor Serial No.________________________________________
Pump Serial No:_________________________________________
Tank Serial No:__________________________________________
Date Purchased/Leased:___________________________________
Dealer Purchased/Leased From:_____________________________
Special Custom Features:__________________________________

14
* Due toour continuing product improvement, specifications are subject tochange withoutnotice. *
REV.
DATE.DWR. NUM.
Surface to Surface Inc.
M-750H
90.0"
92.00
M-750H(GR) ( Hydraulic )
DRY WEIGHT
1800 lbs.
20 / 12 / 10

15
Features and Benefits M-750H Mixer
The M-750H with its rectangular loaf shaped Roto-Mold tank, is a space saving design with almost square footprint
dimensions. Powered by the customer’s own power source, a 16 1/2gpm hydraulic motor drives a 4 inch centrifugal
pump making effective use of the proprietary StS mixing system, this Bentonite Mud Mixer is capable of providing 750
gallons of full yield mud to your drill rig in less than eight (8) minutes. Added benefits to this unit include the ability to
draw water from a second tank and send mud to your drilling rig or storage tank with-out the use of a second pump.
Other power drives available.
Surface to Surface Inc.
Specifications M-750H Mixer Benefits
Dimensions 92”W x 90”L x 75”H Fits any 8’ flat deck and makes efficient use
Approx. Weight 1800 lbs. of available space.
Hopper Height 39 inches high Waist high hopper reduces back strain.
Mixing System 4” Proprietary StS Mixing System Fast, efficient mixing time ( 8 min. mix ).
Mixing Tank 750 gallon Roto-Mold Polyethylene Minimal maintenance required.
Skid frame 5” Steel Channel, Welded Built for the rigors of the construction trade.
Hydraulic Motor Requires 15-16½ us.gpm. @ 2000psi Air Cooled, Industrial rated for long service life.
Hydraulic Valve Variable speed control Allow bentonite mixing at various speeds
Hydraulic system Open loop circuit Simple, field repairable, less maintenance
Pump 4” Cast Iron Centrifugal Trash Pump Rugged & Repairable for extended service life.
Pump Drive Hyd. Motor direct to Bearing Block No expensive couplers or inserts to replace.
Mechanical Seal Self Pressurizing Grease Seal Greaseable seal for more rugged working conditions
Replaceable Wear Plate Hardened plate ahead of Impeller Less wear on internal pump parts and is replaceable.
Pipe Couplers Bolt and Snap –Groove Type Provide fast cold weather maintenance.
Pressure Wand Hopper Maintenance Wand Removal of any build-up caused by additives.
Tank Drain Bottom Tank Drain Supplied Provides fast cold weather tank drainage.
Also available in Diesel (M-750D) - Gasoline (M-750G) – Electric (M-750E) models.

All Specifications Subject to Change Without Notice



Bentonite Mud Mixer
Model M-750H
Surface to Surface Inc.
5150 Forest Road, R.R.#3, Watford, Ontario, N0M 2S0
Tel: [phone]
Check our website for the latest products and specifications
www.stsmixers.com
09/20/12
Hydraulic
90.0"
92.00

16
M-750H
Identifying Your Machine & Components
Location of Tags and PIN Plates

17
SECTION #II
Description, Care and Maintenance

18
M-750H
Description, Care and Maintenance
Polyethylene Plastic Reservoir Tank (750 us. gal)
Maintenance of this tank is required, but is simple. The tank should be cleaned on a regular basis by opening
the drain cap on the tank tee, located at the bottom right end of the tank (see Fig.1) and or open the
customer installed bottom tank drain (see Fig.2) and rinse the tank with clear water. Residue such as leaves,
stones, etc can be removed using a wet /dry vacuum.
All tank ports are of a threaded type bung (see Fig.1) with rubber gaskets. If a leak is noticed between
the tank and gasket, the connection can be tightened up by tightening the large nut flange in the direction of
the arrows (counter clock wise).
CAUTION
NEVER OPERATE THE MIXING
unit with the tank lid open.
If viewing is necessary, open
only the small inspection
vent cap in the center of the lid.
CAUTION
BEFORE LIFTING OR MOVING THE UNIT,
all fluid should be removed from the tank.
CAUTION
TO ENTER THE TANK is not recommended
Personal injury could result from
the presents of hazardous fumes,
remaining fluid or unit start-up.
Fig.1
DANGER
NEVER ATTEMPT REPAIRS
OR DISASSEMBLY
without shuttingoff the hydraulic
power source (customer supplied)
Serious personal inj ury will result.

19
M-750H
Description, Care and Maintenance
Polyethylene Plastic Reservoir Tank (750 us. gal)
INSTALLATION OF (CUSTOMER INSTALLED) TANK DRAIN
Find a suitable location on the tank floor for the drain to be installed, taking into consideration the
placement of the unit on a trailer. LOOK under the deck for obstructions (cross-members, wiring, and axles,
ect.) Allow room for a shut off valve.
Drill holes into floor of tank using the top (inside) portion of the drain as the template.
Make sure the holes are free of burs and both surfaces are clean.
Install the drain bung as per FIG 1. Note the gaskets are on the inside and outside of the tank.
Tighten nuts as to slightly squeeze the rubber gaskets.
Cut a hole into the deck of the trailer or truck for the piping and valve to be installed.
Install 2” pipe nipple and valve into tank bung with a sealant on the threads. CAUTION: DO NOT OVER-
TIGHTEN!
The nipple and valve should not extend to far from the tank without a support, as this will cause excess
stress on the threads, drain bung and the tank floor.
Fill with water and check for leaks.
GASKETS
CUSTOMER SUPPLIED
PIPING AND VALVE
TOP
(INSIDE)
BOTTOM
(OUTSIDE)
FIG 1
TANK FLOOR
1 3/4" Ø
IN FLOOR
Fig.2

20
M-750H
Description, Care and Maintenance
Hydraulic Powered Centrifugal Pump
Care and maintenance of the hydraulic motor and pump are covered in this manual and/or the
manufacturer operator’s manuals supplied and should be read and understood. We suggest the following
daily checks be carried out prior to using the system. Check the fluid level in YOUR hydraulic reservoir is
sufficient. Check the hydraulic filtering system is working properly. Check the pump seal grease cup is full
(see grease cup instructions Fig.5). Check that any water intake valve(s) are open and the reservoir tank has
sufficient liquid to supply the centrifugal pump.
The pump is mounted directly to a bearing block and the hydraulic motor, so there is no “drive
coupler” to check or maintain. The bearings in the bearing block are factory greased to provide constant
lubrication. The pump is the primary component that will see the most wear due to the nature of the
material it is handling therefore it will require regular checks, adjustments and maintenance.
There is a section of this manual dedicated to the pump itself and should be read and understood
which will help should any problems or concerns arise in the field.
The pump should never be allowed to start or run dry, as this WILL damage the internal pump seal (grease
seal) and render the unit inoperable until the seal is fixed.
To prime the pump or check to visually see if the pump is primed, slowly undo the plug on top of the
pump beside the discharge elbow (see Fig.4) and stop after about 3 turns. If the pump is primed, fluid & air
will escape from around the plug threads. This indicates that the pump housing is full, and the plug can be
tightened back up. If no fluid is escaping from around the threads, completely remove the plug.
Fluid or water can be poured into this opening to fill the pump cavity, and a visual of the fluid level inside
the pump can be made. The level should be approximately to the top of the pump housing.
Another way to prime the pump is to have the tank FULL of fluid, and standing off to the side of the
hopper, rotate the hopper valve SLOWLY to the open position. As the valve is opened, you will hear air
escaping followed by fluid, into the hopper itself. Close the valve as the fluid enters the hopper. This means
the fluid in the tank has filled the pump cavity of the pump and flowed from the outlet of the pump to the
remaining piping on the unit.
CAUTION
IMPROPER INSTALLATION OF THE
MECHANICAL or GREASE SEAL
will result in leakage and possible
damage to the seal. All maintenance,
operating and repair of this unit, must be
done per the instructions in the operators
manual for safety and reliability.
Fig.3
DANGER
IN AN EMERGENCY
rotate the flow control valve
lev er tothe STOP position
to halt the pump, and fluid fl ow.
DANGER
NEVER ATTEMPT REPAIRS
OR DISASSEMBLY
without shuttingoff the hydraulic
power source (customer supplied)
Serious personal inj ury will result.
CAUTION
BEFORE STARTING THE HYDRAULIC MOTOR,
BE SURE THE PUMP IS PRIMED!
Check the pumpbyslowly&carefully
opening the plug located on the top
of the centrifugal pump discharge elbow.
A visual inspection canbe made if the fluid
escapes around the plug as it is loosened.
Remove the plug to v iewinside fluid level.
The centrifugal pumpseal WILL be
damaged if allowed to cavitate or run dry.