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Inspection: Prior to installing cutters, it is paramount to inspect the body of the tool. The sleeve of the tool is exposed to very high pressure and heat during operation. Irregularities on the internal surface of the sleeve can ultimately cause further damage to the head or spindle of the machine. If the sleeve is damaged, consult with AceCo’s technical staff before proceeding. Do not sand or hone the internal bore of the sleeve.

Next, examine the base and top plate for damage- bolts should be tightly mated with the base plate of the head. Inspect the bolt holes in the top plate for material that may have been packed into the cavities during the torquing process. Inspect all bolts for wear, scarring (from knives moving during a crash) or damaged/galled threads.

How galling effects clamping force: For the bolt to achieve maximum clamping force, all surfaces (bolt threads, nut threads, top and bottom surfaces of the washers) must be in good condition. Galling or distorted threads on any of these surfaces will affect the clamping force of the bolt. Galling is caused by torquing the bolt/nut without the use of anti-seize compound. Once galling has occurred, the bolt and nut should be replaced to ensure the specified clamping force is achieved. Accurate and uniform clamping force- achieved from clean mating surfaces and structurally uniform bolts, washers and nuts, ensure that knives remain in the correct static position during the entire cycle of operation. Following the correct torquing protocols will result in more consistent joints and a decreased chance of a crashed head.

1. Clean the entire tool-  base, bolts and top plate, to remove any dirt, oil or rust preventative.

2. If necessary, clean dirt from the bolt threads and alignment recesses on the heads of the bolts with a stiff bristle brush or thread chaser. Do not run a die over the bolt threads.

3. Using a fine India stone, lightly stone the knife seating areas (base and top plate) to remove any burrs.

4. Wipe parts clean with a shop towel and Isopropyl alcohol.

5. Blow compressed air around the bolts where they protrude through the head. Dirt and moisture tend to accumulate here. Trapped dirt and moisture can cause corrosion.

6. Verify that the serial number on the top plate matches the serial number on the head base. Heads are manufactured and dynamically balanced as an assembly (base and top plate). Do not intermix heads.

7. Select a pair of balanced cutters and washers (Technical Article on properly balancing new or used cutters); placing one stack and accompanying washer on the outer perimeter of the head by bolt #1. Install the cutters from the other stack on the opposing bolt, one by one, in the appropriate configuration and rotation. Washers must be kept with the knife stack for with they were balanced.

8. As each cutter is installed on the bolt, rotate the cutter back and forth on the bolt. If any roughness is felt, it is likely that dirt is between the cutters and bolt. Remove and clean cutters before proceeding.

9. Install the cutters on bolt # 1 as outlined in steps 7,8.

10. Repeat this procedure on the remaining cutter stacks. One pair at a time.

11. When all cutter stacks have been installed, Locate the indexing arrows on the top plate and on the base of the finger joint head.

12. Install the top plate with the indexing arrows aligned and facing each other.

13. Coat all bolt threads with anti-seize compound.

14. Coat the top and bottom side of each washer with anti-seize compound and install on the appropriate bolt.

15. Coat the bottom of each nut with anti-seize compound and install on the bolt for which they are numbered.

CAUTION: Do not torque nuts on bolts without a washer installed. Damage to the top plate will result.