Nabtesco GM Series - User Manual

Questions and Answers

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Nicole TaylorAug 14, 2025
How to fix oil leakage in Nabtesco Engine?
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  sydney38Aug 14, 2025
  If you notice oil leakage from the mating surfaces of your Nabtesco Engine, try polishing the surface with a grindstone or polishing paper. For looseness of bolts either from the case or from the hydraulic motor, retighten them. If the leakage is from the floating seal, wash away any earth and sand. If you see cracks with stones, wear of sliding surfaces, or O-ring creep, replace the GM. For O-ring damage, replace the O-rings. If there are scratches on the sealing surface, polish the surface using a grindstone or polishing paper.
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Kimberly SotoAug 18, 2025
What to do if Nabtesco GM does not rotate?
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  kimberly73Aug 18, 2025
  If your Nabtesco Engine does not rotate, several issues could be the cause. It might be due to a low set pressure of the relief valve, in which case you should set the pressure correctly. Other potential causes include a malfunction of the pump, direction-switching valve, hydraulic motor, or brake valve, all of which would require repair. Also, check for damage to the gears, which would necessitate replacing the GM, or if the engine is overloaded, remove the load.
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vreidAug 21, 2025
Why is the surface temperature of the reduction gears high in Nabtesco GM Engine?
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  hkingAug 21, 2025
  If the surface temperature of the reduction gears in your Nabtesco Engine is high, it could be due to a lack of lubricants; replenish them to the proper amount. Another cause might be pitting in the bearings and gears, which requires replacing the GM. Also, check if hydraulic oil has entered the gear case, and if so, replace the oil seal and lubricants.
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Jasmin HarrisAug 25, 2025
What causes low pump discharge speed in Nabtesco Engine?
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  cochrannicholasAug 25, 2025
  If the pump discharge speed is insufficient in your Nabtesco Engine, it could be due to the pump not working properly or excessive pump leakage; in either case, replace or repair the pump. Another possible cause is a large amount of leakage from the hydraulic motor, which would require replacing the GM.
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Rebecca SnyderAug 27, 2025
Why Nabtesco GM Engine rotated by load during use?
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  Mary PorterAug 27, 2025
  If your Nabtesco Engine rotates by load during use, it could be due to reduced volumetric efficiency of the hydraulic motor, which requires replacing the GM. Another cause could be increased internal leakage (drain) of the brake valve, in which case you should replace or repair the brake valve. Check if the parking brake is not working due to damaged springs. Also, inspect for friction plate wear, and if present, replace the friction plate and the mating plate. Finally, check for blockage of the oil passage by contaminants, and replace or repair the brake valve if needed.
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jamie13Aug 31, 2025
How to troubleshoot abnormal noise produced by Nabtesco Engine?
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  matthew58Aug 31, 2025
  If your Nabtesco Engine produces abnormal noise, it may be due to damage to the hydraulic motor or reduction gears, requiring replacement of the GM. Alternatively, it could be caused by vibration of pipes, in which case you should clamp the pipes.
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zthomasSep 3, 2025
What causes Nabtesco Engine to meander when used as a travel motor?
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  thompsondonaldSep 3, 2025
  If your Nabtesco Engine meanders when used as a travel motor, it could be due to several reasons. The left and right discharge oils might be different, requiring repair of the pump. Alternatively, the left and right hydraulic motor drains could be different, necessitating replacement of the GM. If it occurs at high pressure, it also indicates that the left and right discharge oils are different. Another possibility is that the left and right hydraulic motor drains are different, requiring repair of the pump or the control valve. Also, the left and right brake valves movement might be different, so replace the brake valve. Finally, relief pressure drop on either side of the control valve can cause this, so correct set pressure or replace the relief valve.
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Patricia RodriguezSep 6, 2025
Why Nabtesco GM Engine do not switch from low speed to high speed?
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  Mr. David MartinSep 6, 2025
  If your Nabtesco Engine does not switch from low speed to high speed, it could be due to malfunction of the high pressure selection check valve, requiring replacement of the control valve. Alternatively, it could be a malfunction of the switching valve, so replace the 2-speed spool. Low pilot pressure can also cause this, so set to the specified pressure. Other potential causes include malfunction of the 2-speed switching piston or blockage of the passage at the 2-speed choke, both requiring replacement of the GM.
U
utranSep 9, 2025
Why Nabtesco Engine do not switch from high speed to low speed?
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  Laura WernerSep 10, 2025
  If your Nabtesco Engine does not switch from high speed to low speed, it could be due to a malfunction of the switching valve, so replace the 2-speed spool. It may also be caused by a malfunction of the 2-speed switching piston, requiring replacement of the GM.

Nabtesco GM Series Specifications

General

Brand	Nabtesco
Model	GM Series
Category	Engine
Language	English

Nabtesco GM Series - User Manual

Table of Contents

Questions and Answers

Nabtesco GM Series Specifications