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712MT OPERATOR’S MANUAL                            9/18/20                                            Page 4 of 16 

SAFETY INSTRUCTIONS OVERVIEW (continued) 

 
Wear safety goggles and a hard hat while operating or observing!  

WARNING

: The dig chain may throw stones and debris.   

 
Wear adequate hearing protection while operating or observing. 

WARNING

: Exposure to loud noise is cumulative and may permanently 

damage your hearing.   

 
Wear safety boots and gloves. Wear close-fitting clothing. Contain  
long hair. Do not wear jewelry. Wear reflective clothing if working near traffic.   
 
Only operate outdoors and avoid breathing engine exhaust and fumes.  

WARNING

: Engine exhaust contains carbon monoxide gas that is toxic. 

Breathing it can cause unconsciousness and death.   

 
Adequate lighting is required, daylight or artificial, for safe operation of the trencher. 
 
Allow adequate side and overhead clearances between trencher and buildings, fences, and trees. 

WARNING

: If the digging chain contacts an object, the digging chain can climb upward quickly and tip the 

trencher toward the operator. Serious injury or death will result by operator contact with the moving chain. The 

digging chain can suddenly drag the machine forward if the trencher is forced too quickly into the ground or 
catches on a buried object. 

 

WARNING

: Contact with the dig chain or auger while in operation will cause serious injury or even death. The 

teeth of the dig chain are sharp. Avoid contact even when the chain is not moving. 

 
Avoid inclines if at all possible. 

WARNING

: Navigating on any incline increases the danger of the trencher losing traction or rolling over, 

especially if the surface is wet. If you lose control, get out of the way immediately to avoid personal injury. 

Navigation on inclines should be especially slow and turns very gradual. Refer to the incline diagram in the 
section, “GROUND TRANSPORT”. 

 

WARNING

: The weight of the trencher or walking near the edge of the trench could cause collapse of the 

trench wall. If driven along the edge of the trench, the trencher could suddenly turn over.   

 
Avoid operating adjacent to drop-offs or embankments. 
 

WARNING

: The trencher is very heavy. 

DO NOT

 attempt to manually lift it.   

 

Keep away from wheels to avoid getting crushed. 

WARNING

: Getting run over by the trencher will cause injury.  

 

Always leave trencher parked on a level surface. 

WARNING

: Do not park on incline. Move the trencher to a level area.  

 

Do not leave trencher unattended with the engine running. 

Содержание HT712

Страница 1: ...mal trenching Consider using a backhoe or other heavier equipment for such conditions TABLE OF CONTENTS LUBRICATION REQUIREMENTS 2 SAFETY MESSAGES 3 SAFETY INSTRUCTIONS OVERVIEW 3 TRENCHER OPERATING I...

Страница 2: ...MT OPERATOR S MANUAL 9 18 20 Page 2 of 16 LUBRICATION REQUIREMENTS Grease at the intervals indicated per the illustration of grease lubrication points There is also a grease diagram decal on the machi...

Страница 3: ...are affixed to the trencher near specific hazards Read this manual and study ALL decals on the trencher before operating the trencher SAFETY INSTRUCTIONS OVERVIEW READ SAFETY AND OPERATING INSTRUCTIO...

Страница 4: ...can suddenly drag the machine forward if the trencher is forced too quickly into the ground or catches on a buried object WARNING Contact with the dig chain or auger while in operation will cause seri...

Страница 5: ...re performing any cleaning or maintenance Avoid contact with hydraulic fluid WARNING When machine is operating hydraulic fluid is under extreme pressure and can get under skin and burn or poison Keep...

Страница 6: ...cher a bit if necessary until each pin finds a hole to drop into The hubs are now locked Disengaging one hub makes it much easier to turn the trencher when transporting under power 2 IGNITION SWITCH T...

Страница 7: ...H There are two ignition switches One switch is located on the control panel with the other trencher controls for your convenience The other is located on the engine Use these to start and stop the en...

Страница 8: ...5 Move the THROTTLE to about 1 3 of the way back This increases throttle It is located above choke 6 Pull start cord located on engine recoil When the engine starts open the CHOKE turn choke off after...

Страница 9: ...r the digging chain slows down release the WHEEL DRIVE CONTROL until the engine recovers to operating speed then reactivate the WHEEL DRIVE CONTROL If traction is limited the trencher may be tilted ba...

Страница 10: ...your safety Use half throttle for slower transport speed Keep away from tires to avoid getting crushed WARNING Getting run over by the trencher will cause injury Never allow anybody to ride on the tre...

Страница 11: ...atch the ramps and lower to the ground 3 Line up the trencher with the rear of the trailer The dig chain should be toward the trailer 4 Throttle engine down and move control speed lever halfway betwee...

Страница 12: ...ty in the measurement given a 95 confidence interval is 1 1 m s2 Safety gloves help to isolate the hands from the vibration keep them warm and dry maintain blood circulation and make operators less su...

Страница 13: ...ermine location of utilities before trenching WARNING Fiber optic cables convey laser light that can injure your eyesight CALL 811 or 1 888 258 0808 TO LOCATE UTILITIES BEFORE TRENCHING US OR CANADA T...

Страница 14: ...e gas oil petroleum water or sewer In any case stop digging shut off the engine and evacuate the area immediately Call 911 for help Electrical wires or cables If you think that you may have severed el...

Страница 15: ...low adequate side and overhead clearances between trencher and any objects such as buildings fences and trees WARNING If the digging chain contacts an object the digging chain can climb upward quickly...

Страница 16: ...6 9 10 IGNITION 7 8 IGNITION SWITCH 6 7 8 10 LOADING 11 LUBRICATION 2 NAVIGATING 4 10 11 OPERATING INSTRUCTIONS 3 6 11 OPERATOR PREPARATION 12 PERSONAL PROTECTION 4 11 12 PLUNGE CUT 9 PROTECTION 4 11...

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