USMOWER QA60 User manual
Operator’s Manual
Skid Steer
Rotary Mower
11949 Westar Ln
Burlington, WA 98233
360.757.7555
www.usmower.com
US Mower Rotary and Flail Mowers for Excavator and Skid Steers are used by com-
mercial mowers for industrial mowing applications such as: land clearing, pipeline main-
tenance, ditch maintenance and general herbicide free vegetation management. We of-
fer Rotary Mowers and Flail Mowers for both Skid Steers and Excavators as well as
Complete Tractor Integrated Mowers for Case, John Deere, New Holland, Challenger
and McCormick. US Mower equipment is manufactured to have a long, productive ser-
vice life. Many contract mowers have reported 5,000 or more hours of working time
on their mowing equipment. The very rst ail mower built in 1999 is still in use today.
All US Mower ail mowers and rotary mowers are designed and manufactured in Burling-
ton, WA. From idea to nished project, it all happens right here in our USA factory. Each
design feature, material and component is carefully selected to provide the best per-
formance and value to our customer. We know that a ail or rotary mower is a big in-
vestment to our customer, so we make it from high strength steel, DOM tubing, and other
high quality components. We also service and stock each component to build the mow-
ers and our customers can purchase them direct form US Mower or one of our fantas-
tic dealers located throughout the USA and Canada. Because we are a fabricating man-
ufacturer, we can also make custom mounts, a variety of options and special requests.
Creating Mowing Solutions Manufactured in the USA
US Mower Rotary and Flail Mowers for Excavator and Skid Steers are used by
commercial mowers for industrial mowing applications including land clear-
ing, pipeline maintenance, ditch maintenance and general herbicide free
vegetation management. We offer Rotary Mowers and Flail Mowers for both
Skid Steers and Excavators as well as Complete Tractor Integrated Mowers
for Case, John Deere, New Holland, Challenger and McCormick. US Mower
equipment is manufactured to have a long, productive service life. Many con-
tract mowers have reported 5,000 or more hours of working time on their mow-
ing equipment. The very first flail mower built in 1999 is still in use today.
All US Mower flail mowers and rotary mowers are designed and manu-
factured in Burlington, WA. From idea to finished project, it all happens
right here in our USA factory. Each design feature, material and compo-
nent is carefully selected to provide the best performance and value to
our customer. We know that a flail or rotary mower is a big investment
to our customer, so we make it from high strength steel, DOM tubing, and
other high quality materials and components. We also service and stock
each component to build the mowers and our customers can purchase them
direct form US Mower or one of our fantastic dealers located through-
out the USA and Canada. Because we are a fabricating manufacturer, we
can also make custom mounts, a variety of options and special requests.
360.757.7555 www.usmower.com
Read the safety messages on the implement and in your manual. US Mow-
er has designed this implement to be used with all its safety equipment
properly attached to minimize the chance of injury in the event of an acci-
dent. There is no substitute for an informed, cautious, safe-minded oper-
ator who recognizes potential hazards and follows good safety practices.
• Study Operator’s Manuals and Safety Decals for skid steer and cutter thor-
oughly to prevent misuse, abuse and accidents.
• Do not allow riders on skid steer or implement. Falling off may cause serious
injury or death by being run over by Skid steer or cutter. Keep Children Away!
• Operate with ROPS and fastened seat belt to prevent injury and possible crush-
ing death from falling off or skid steer overturn.
• Wear hard hat and safety glasses for personal protection.
• Make certain that SMV sign, warning lights and reflectors are clearly visable.
• Block up or support cutter securely before putting hands or feet under or
working underneath lifted components to prevent crushing injury or death
from sudden, inadvertent dropping. Make certain area is clear before lowering.
• Follow local traffic codes. Slow down at night, in turns, and on hillsides.
• Before dismounting, secure implement in transport position or lower to Ground.
Disengage Interlock, Turn off machine. Never mount or dismount a moving vehi-
cle to prevent crushing injury or death.
Failing to follow safety messages and operating instruc-
tions can cause serious bodily injury or even death to the
operator or others in the area. Your mower is a powerful in-
dustrial machine with substantial capacity to cause proper-
ty damage, personal injury or even death when used improp-
erly or without proper safety equipment.
BEFORE YOU START!!
Safety
There are obvious and hidden potential hazards involved in the
operation of this mower. Serious injury or death may occur un-
less care is taken to insure the safety of both the operator and
other persons in the area. The following is a list of some safe-
guards which should be followed.
In addition to the design and configuration of equipment, hazard
control and accident prevention are dependent upon awareness,
concern and prudence. suitable training of personnel involved
in the operation, transport, maintenance and storage of equip-
ment is required.
Safety
• Dress for the job. Choose close-fitting clothes and long pants, hearing protec-
tion, eye protection, work boots with traction and heavy gloves (when handling
blades). Do not wear loose-fitting clothes or jewelry, which can get caught or
hung up on a machine and cause injury.
• Know your machine. Read the operators manual to familiarize yourself with
your machines unique features. For example deflector shields, adjustments,
skid shoes, retention systems and maintenance.
• Read warning labels and check safety features. Never operate your mower if
your safety guards and devices are not in place. Replace safety guards and de-
vices if damaged or not operating properly.
• stop mowing if passersby are within 100 yard radius from mower head.
• never allow children to operate, ride on, or come close to mower or equipment.
Never lift a person or allow anyone to stand on a mower head. keep bystanders
and pets clear and off of equipment.
• Extreme care should be taken when operating near loose objects such as grav-
el, rocks or general debris. These objects should be removed or avoided to
prevent injury from thrown objects. Where grass and weeds are high enough
to hide debris that could be struck by the blades, the area should be inspected
and large debris removed. Mow cleared area at an intermediate height, inspect
closely for remaining debris and remove. Mow again at desired final height.
• Keep the mower head at least 10 feet from electric lines and pipe lines to pre-
vent accidental contact and possible serious injury or even death.
• Pressurized hydraulic fluid can penetrate the skin causing serious injury. Do
not use your hand to check for leaks on a pressurized system. Use a piece of
cardboard or paper to search for leaks. Stop the engine and relieve pressure
before connecting or disconnecting lines. Tighten all connections before
starting the engine or pressurizing lines. If fluid is injected into the skin, ob-
tain medical attention immediately.
• Check attachment points. Check your mower’s connection to the power unit. All
pins, bushings and linkage should be checked to insure they are free to travel
the full distance without interference. Repair if necessary.
• Conduct daily inspections. Verify that all shields and guards are in proper
working order. Check blade attachment bolts to insure all blades are present
and in good condition. Check blades for cracks around bolt hole. Check that
hydraulic hose connections are completely engaged.
Operating Safety Zone---100 Yard Radius
from Mower Head
Stop! And allow all vehi-
cles to pass through operat-
ing “Safety Zone” before
continuing cutting. Operator
awareness is key to safe op-
eration. Never operate or
continue to operate this ma-
chine when there is a person
or vehicle within a 100 yard
radius of the cutting opera-
tion. If a person comes inside
your operating “Safety Zone”
(100 yard radius) shut the ma-
chine down.
KNOW YOUR OPERATING SAFETY ZONE!!
Installation
Before starting the operator should read and understand
the owner/operation manual for the parent implement to de-
termine the proper procedure for turning on the auxiliary
hydraulics to run the mower.
Attaching Mower to Skid Steer
Securely attach the QA60 or QA72 mower in the same manner you would attach a
bucket or other Skid Steer attachment. Confirm that the locking mechanism is
properly engaged.
Carefully clean the Hydraulic quick couplers before making connections. Dirt
quickly damages the hydraulic system. Always cover or connect couplers together
when not in use.
Connect supply, return and case drain lines. Confirm that the hydraulic quick cou-
plers are fully engaged and locked by turning the collars. Ensure that limiting
straps are connected to skid steer arms.
Check with your power units manuals on how best to release the pressure in the
auxiliary lines for easy coupling to the connectors.
Activate the auxiliary hydraulic circuit with the cutter head raised off the ground.
Case drain line, what and why is it needed?
The case drain protects the mower motor shaft seal from excessive pressure. Mo-
tor shaft seals are usually rated to 100 psi for brief periods or less than about
50 PSI continuously. High pressure oil from the gear section travels between the
shaft and its sleeve bearing to an area behind the shaft seal. This flow continues
on through the return line by way of an internal check valve or through an exter-
nal case drain. In most compact equipment return line pressure is high enough to
cause either abrupt seal blowout (150+ psi) or early failure of the motor shaft.
Higher pressure seals are available, but are not always reliable and cause other
problems as well.
The best solution is a dedicated case drain. Your machine may have an internal or
external case drain system that can accommodate the small volume of gear motor
case flow. Contact your vehicle dealer or manufacturer for technical details.
Motor shaft seals are not covered under warranty if case drain is
not properly installed or fails. Make sure case drain line couplers
are properly connected.
Maintenance
Blade Disc Assembly
Inspect Blade Disc and Bolts daily for excessive wear, cracks and tightness.
To loosen blade bolts, follow these instructions:
1. Lock bar or disc into a solid position by placing a piece of wood between the ro-
tor and the rotor guard.
2. Drive out roll pin in castle nut with 1/4” round punch.
3. Remove blade bolt nut with 1 13/16” socket or box wrench.
4. With blade hanging in relaxed position, strike blade with hammer until bolt
comes loose in its hole. Remove bolt and blade from rotor.
Blades should always be replaced in pairs. Blades of different weights can cause
serious imbalance and damage to the machine and personnel. When replacing
blades, check the condition of the blade bolts and nuts.
Replace bolt if it shows significant wear or damage or has the slightest indication
of a crack. Rotary mowers take and deliver a terrific beating. Shock and vibration
levels are very high so bolts loosen. It is important to check for loose or missing
bolts at least once a day and twice if cutting has been particularly tough. Blade
bolts are designed to be used twice if wear is not advanced. Simply rotate the bolt
90 degrees and retighten. The square shoulders on the bolt are intended for just
this purpose.
Always use new nuts with new blade bolts. Apply anti-seize compound to the bolt
threads and tighten to 75 ft. lbs. Max. Install new roll pin.
Blades are two sided and can be turned over if only worn on one side, but do not
reuse if bent. Always replace blades when they are excessively bent, deformed,
or out of balance.
Rotary Blade Kit Part #2564243
(Includes 2 Blades, 2 Rotary Blade
Bolts, 2 Slotted Nut, 2 Roll Pin)
QA60 QA72
2562028 27# Rotary Blade
2562010 27# Rotary Blade Bolt
2600232 27# Rotary Blade Bolt Nut
2562033 27# Rotary Blade Bolt Pin
Parts List
2562028 27# Rotary Blade
2562010 27# Rotary Blade Bolt
2600232 27# Rotary Blade Bolt Nut
2562033 27# Rotary Blade Bolt Pin
2559386
2558734
2556320
2556321
2556286
2556412
2558654
2556322
2556323
2558483
2556324
2561265
ITEM NO.
PART NUMBER
DESCRIPTION
QTY.
1 2556286
Rotary Spindle Housing
1
2 2559386
SN200 Spindle Nut - LH Thread
1
3 2556320
Rotary Spindle Upper Bearing
1
4 2556323
Rotary Spindle Lower Bearing
1
52556321
Rotary Spindle Upper Bearing Race
1
6 2556322
Rotary Spindle Lower Bearing Race
1
7 2561265
2010 Rotary Spindle
1
82556324
Spindle Seal
1
9 2558483
Rotary Seal Spacer
1
10 2558734
O-Ring
1
11 2556412
1/8 Pipe STR Zerk
1
12 2558654
5 PSI Poppet Valve
1
QA60 and QA72 Spindle
Housing Assembly Exploded
2562843
QA72 High Intensity Spindle
Must be replaced with above part #
Maintenance
Adjusting Pre-Load
1. Adjust the two lock screws on the nut so that
the nut will have some drag when turned on the
spindle.
2. Apply red locktite to spindle nut, tighten to 40
ft. lbs., then turn the spindle 3-4 turns.
3. Back off nut 1/4 turn. Tighten to 35 ft. lbs.
4. Tap the top of spindle nut around it’s perimeter
with small hammer to set the spindle nut threads.
Tighten lock screws. Tap again. Do this until the
lock screws will not tighten further.
5. Top off with grease.
6. Apply o ring to motor end of spindle housing.
7. Be sure to apply red locktite to motor housing
bolts.
8. With the motor in place, pump grease into the as-
sembly through the grease whip until the hous-
ing is filled. Including grease used for assem-
bly, the assembly should take 3 tubes of grease.
US Mower recommends High Quality NLGI#0 Lithi-
um Base.(Calcium Base Grease is useful for very
wet conditions.)
Spindle Housing Maintenance
Other than keeping the bearings well greased, the single most important factor
to longevity of the spindle assembly is bearing pre-load. Bearing pre-load must be
maintained. Pre-load is provided by the spindle nut at the top of the spindle. The
torque on this nut should be close to 40 ft. lbs. Pre-load may need adjustment af-
ter several hard ground strikes. A helicopter like noise, when the plane of the
deck is changed, is a clear indication of the need for pre-load adjustment. If in
doubt, manually examine pre-load.
Set deck in a vertical position and grip edges of the blade bar while alternately
pulling hard on one side and pushing hard on the other. If any play can be detected
pre-load adjustment is needed.
Assembling the spindle housing (USE HEAT TO REMOVE SPINDLE NUT)
If the spindle housing assembly must be reassembled the following steps can help
ensure the performance and longevity of the unit:
1. Clean the housing and spindle, removing all metal chips, paint, dirt, used grease
and other contaminants.
2. Place the spindle housing motor side up insert small cup and flip over, insert
large race. Be certain races are completely bedded.
3. Pack large bearing with NLGI#0 Lithium grease and insert. Clean off excess
grease after inserting.
4. Insert spacer with widest lip facing up, apply retaining compound to inner bear-
ing where spindle goes. then insert spindle seal with solid face outward.
5. Press cleaned spindle down into spindle housing.
6. Flip housing over and fill cavity with grease.
7. Grease and Press in small bearing. Use retaining compound on inner surface.
8. Apply locktite 243 to set screws and screw into Spindle Nut.
9. Apply locktite 262 to threads and hand thread spindle nut onto spindle. (nut is
left hand thread and only goes on one way. If it doesn’t thread on, flip over and
hand thread on again). Follow adjusting Pre-Load Instructions below
Parts List
1
2
6
5
3
4
7
8
8
ITEM NO.
PART NUMBER
DESCRIPTION
QTY.
1
QA60 Weldment
2560977
QA60 Weldment
1
22559479
Rotary Spindle Housing Assembly
1
3
------
Motor
1
42559720
QA 60 Blade Disk
1
52560047
3/4"-16 x 3 Grade 8 Bolt
6
62600239
3/4"-16 Top lock Nut
12
7 2557954 3/4"-10 x 2.5" Grade 8 Bolt 6
82563020
1/2-13 x 4 Spindle Stud
4
92557338
1/2"-13 Hex Nut
8
Parts List-QA60 Rotary Mower
Parts List
Parts List-QA72 Skid Steer Rotary Mower
66
4
5
2
10
12
1
11
8
9
QA72 Blade Disc
7
2
10
3
5
1
6
4
9
8
7
11
12
QA72
ITEM NO.
PART NUMBER
DESCRIPTION
QTY.
1 2561349
QA72 Weldment
1
2 2562031 1
3
------
2.5" M257 Motor
1
4
2562010
27# Heavy Rotary Blade
Bolt
2
52562028
27 lb Rotary Blade
2
62600232/2562033
2" Slotted Nut/Tension Pin
2/2
72559479
Rotary Spindle Housing
Assembly
1
82564245
1/2-13 Lock Nut
8
92563020
Rotary Spindle Stud
4
10 2561100
3/4-16X 3" BOLT
6
11 2561299
3/4-16 x 3" Hex Bolt Plain
Finish
6
12 2558107
3/4-16 Top Lock Nut
12
ITEM
NO.
PART
NUMBER
DESCRIPTION
QTY.
1 2556286
Rotary Spindle
Housing
1
22559386
SN200 Spindle Nut -
LH Thread
1
32556320
Rotary Spindle
Upper Bearing
1
42556323
Rotary Spindle
Lower Bearing
1
52556321
Rotary Spindle
Upper Bearing Race
1
62556322
Rotary Spindle
Lower Bearing Race
1
72562843
High Intensity Rotary Spindle
1
82556324
Spindle Seal
1
92558483
Rotary Seal Spacer
1
10 2558734
O-Ring
1
11 2556412
1/8 Pipe STR Zerk
1
12 2558654
5 PSI Poppet Valve
1
US Mower Factory Warranty
Exclusions not covered by warranty:
-Components showing evidence of operational misuse, abuse or modification.
-Components showing evidence of maintenance neglect including, but not limited to:
1. Failure to follow the lubrication schedule
2. Failure to maintain proper hardware bolt torque. Inspect frequently.
3. Failure to maintain proper bearing pre-load.
4. Poor quality oil, Improper oil level
5. Oil filters not replaced as needed, inappropriate filter installed
-Technician or mechanics travel time
-Machine pick-up and or delivery to repair facility.
-Components classified as consumables.
-Hydraulic hoses not of USM manufacture-Note: If an otherwise warrantable hose is replaced
from other sources, a credit will be issued which will represent USM’s cost of manufacturing
that hose and shipping by UPS ground.
-Bent flail shafts or shaft stubs
-The warranty will be considered void if closed components are disassembled prior to return.
Closed components include, but are not limited to: hydraulic pumps, motors, and cylinders.
-All replacement components will be shipped to customer/dealer via UPS Ground. All re-
placement components shipped are invoiced as a matter of course. Components that require
evaluation at the factory must be shipped freight prepaid. A credit will be issued for the re-
placement component and freight when it is determined that the warranty is applicable. All
warranty work or replacement components must be pre-authorized by US Mower. US mower is
not responsible for unauthorized repairs or replacements. If there are questions regarding
the applicability of warranty, a call to USM is recommended before work proceeds.
Credit for Labor
Labor credit for a warrantable repair will be issued only for work done in a service dealer’s
shop. No labor credit will be issued for work done in the field (i.e., at the machine site) except
by specific factory authorization. Travel time to and from machine will not be warranted. Ac-
tual warranty compensation will be based on USM flat rate manual.
CREDIT WILL NOT BE ISSUED AND WARRANTY IS NOT VALID FOR ANY UNIT THAT IS
NOT PAID WITHIN TERMS OF THE INVOICE INCLUDING THE SERIAL NUMBER FOR PUR-
CHASED COMPONENT REGARDLESS OF THE END USER. WHOLESALER OR DEALER IS RE-
SPONSIBLE FOR ALL COSTS OF WARRANTY REPAIRS UNLESS INVOICE IS WITHIN TERMS.
Damage and Injury
USM liability is specifically limited to the replacement of components for its products if a
warrantable defect is discovered. Collateral damage to property or personal injury is ex-
clusively the responsibility of the owner and or operator since USM has no control over the
circumstances in which it’s equipment is used. Lost time or expense which may have accrued
because of defects is not covered.
Express Warranty
Seller warrants that:
The goods to be supplied pursuant to this agreement (purchasers agreement to buy and sell-
er’s agreement to sell) are fit and sufficient for the purpose intended.
The goods are merchantable, of good quality and free from defects within the seller knowl-
edge, whether patent or latent, in material or workmanship.
The seller has title to the goods supplied in that the goods are free and clear of all liens,
encumbrances and security interests. All warranties made in this agreement, together with
service warranties and guarantees shall run to buyer and the original customer of buyer.
THERE ARE NO OTHER WARRANTIES EITHER EXPRESSED OR IMPLIED
Should you have questions regarding warranty issues or experience any problems, please call
USM warrants all of its mowers for a period of 12 months.
The warranty specifically covers manufacturing or component defects only. Defects or damage
caused by non-US MOWER installers or owner/operators are not covered.
Normal wear parts are not covered by this Warranty
www.usmower.com
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