Monthly Maintenance Checklist - Power Tong - Farr HD8625 Technical Manual

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MONTHLY MAINTENANCE CHECKLIST - POWER TONG

The following maintenance checklist is intended as a guideline rather than a definitive maintenance schedule. Your equipment may require
more, or less, maintenance depending upon the frequency of use, the percentage of maximum torque that your equipment is routinely
subjected to, and the field conditions under which your equipment operates. Farr recommends that the following inspection and mainte-
nance procedures be performed monthly, or in conjunction with your maintenance foreman's experience and best estimate of when your
equipment is due for this maintenance.
1.
Rotate cage plate/rotary gear until the opening in the rotary gear faces towards the rear of the tong.
DO NOT PERFORM ANY FURTHER ACTIONS OR MAINTENANCE WHILE THE TONG IS CONNECT-
ED TO ANY HYDRAULIC POWER SUPPLY. FARR RECOMMENDS THAT ALL HYDRAULIC LINES
ARE FULLY DISCONNECTED, AND RESIDUAL HYDRAULIC PRESSURE IS BLED OFF. ENSURE
ADEQUATE CONTAINMENT IS IN PLACE TO PREVENT ENVIRONMENTAL CONTAMINATION FROM
RESIDUAL HYDRAULIC FLUID.
D
ePressurIze
1) De-energize the power unit.
2) Repeatedly actuate the tong motor control valve lever IN BOTH DIRECTIONS to dissipate any residual pressure in the
valve and motor.
2.
3) Remove the hydraulic SUPPLY line from the equipment.
4) Repeatedly actuate the remaining control valve levers IN BOTH DIRECTIONS to dissipate any residual pressure in the
remainder of the hydraulic control system.
5) Disconnect the hydraulic RETURN line from the equipment.
6) Disconnect remaining hoses such as case drains, or lines connected to the turns counter.
HYDRAULIC PRESSURES AS HIGH AS OPERATING PRESSURE MAY REMAIN TRAPPED IN SMALL
AREAS OF THE EQUIPMENT. ENSURE ALL MAINTENANCE IS CARRIED OUT BY A QUALIFIED
SERVICE TECHNICIAN, AND THAT ADEQUATE PERSONAL PROTECTIVE EQUIPMENT IS USED TO
GUARD AGAINST PRESSURE INJURIES
Clean the exterior of the tool thoroughly, using either water (if using a pressure washer ensure a low-pressure wash wand is
3.
used), or an appropriate solvent-based grease-cutting cleaner such as Varsol. Ensure adequate containment is in place to
prevent environmental contamination from residual hydraulic fluid, dirty grease, and cleaning agents.
4.
Remove the access panel on the side of the tong directly adjacent to the shifter mechanism.
Clean the interior of the tong thoroughly, using either water (do not use a pressure washer), or an appropriate solvent-based
5. grease-cutting cleaner such as Varsol. Ensure adequate containment is in place to prevent environmental contamination from
residual hydraulic fluid, dirty grease, and cleaning agents. Make a note if any metal shavings or metal pieces are flushed out of
the gear train cavity - if shavings or metal pieces are seen the tong must be overhauled before it is returned to service.
6. Inspect all fasteners and fastener safety wires (if equipped). Replace any missing fasteners - use Grade 8 bolts only unless
otherwise specified. Re-torque all external fasteners to SAE specifications.
7. Repair or replace any damaged or missing external body parts, such as torque gauge mounts, hydraulic supports, safety door
protectors, etc.
Perform a visual inspection of all fasteners and protruding body pieces (example: hydraulic valve mounts, inlet & outlet line
8.
supports, tong legs, shifter handle pivot lugs). Tighten or replace loose or missing fasteners.
Inspect tong for signs of premature wear, or moving parts that are rubbing (bare metal where there used to be paint is a good
9.
indication of wear.
Inspect all paint - locations in which the paint has been damaged must be repaired prior to the tong being returned to service.
10. Prepare areas to be painted to ensure they are free of grease, dirt, or solvent. Touch up using a solvent-based acrylic paint
- "McCoy Grey" is paint color number RAL7015, "McCoy Yellow" (hazard areas) is RAL1007, and McCoy Green is RAL6029
(contact Farr sales for paint number for custom paint applications). Allow sufficient time for paint to dry before proceeding.
Visually inspect all load-bearing welds. Any weld that is cracked or separating must be repaired and repainted before returning
11.
the tong to service.
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