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ROUTINE INSPECTION AND MAINTENANCE
1. VISUAL INSPECTION
Detect a potential problem early.
TIE RODS AND FASTENERS
Inspect all fasteners and retighten as necessary. On GH06
through GH4 models, inspect tie rod assemblies for loose top
nuts. On the GH6 model, inspect tie rod assemblies for cracked
or missing lock plates and lock rings. If these parts are missing,
consult NPK Service Department at 800-225-4379. See pages
105 and 106 for torque values.
WELDS
Check for cracks, repair as necessary, see page 107.
HOSES AND TUBING
Check for oil leaks, loose clamps and
hose abrasion.
RUBBER MOUNTS
Inspect for damage.
HYDRAULIC OIL
MAINTAIN A CLEAN HYDRAULIC SYSTEM
If non-petroleum oil is used, contact NPK Service Department for compatibility.
Keep hoses clean and capped when dismounting or storing hammer. Change oil
and filters as recommended by carrier manufacturer. Periodic oil sampling is
recommended.
2. DEMOLITION TOOL LUBRICATION
Important:
It is imperative that grease is maintained in the tool
bushing contact area at all times. This may require
hourly greasing depending on job conditions.
Important:
The hammer must be in a vertical position with
downforce applied to push the tool all the way in.
This prevents grease from entering piston impact area.
Pump grease into grease
fitting (30) until grease is seen coming out between the tool and bushing.
USE A GOOD QUALITY, HIGH TEMPERATURE EP#2 GREASE CONTAINING ANTI-
WEAR ADDITIVES. NPK recommends a Lithium Base, Moly (Molybdenum
Disulfide) or other surface protecting additives, EP (Extreme Pressure), NLGI #2
Grease. A high drop point (350° to 400°) grease is desirable.
If machine is equipped with an AUTOLUBE System, check grease reservoir daily.
3. TOOL and TOOL BUSHING WEAR
Check the tool and tool bushings for damage, wear or deformation on a regular weekly
basis. Replace the tool and/or bushings when wear exceeds the maximum clearance
limit. See MAXIMUM TOOL TO TOOL BUSHING CLEARANCE, see pages 84 and 85.
Do not hardface or sharpen the tool point with a cutting torch.
Excessive heat from torching or welding causes
embrittlement, breakage, and flying pieces. Resharpen only
with a lathe or milling machine using sufficient cooling.
Please consult your authorized NPK Dealer or NPK Service Department for additional
information.
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DO NOT SUBMERGE HAMMER UNDERWATER
Unless modified for underwater operation.