7. Maintenance and Repair
30
PNEG-2174
Sampler - Model GRA
1. Hand tighten the torque hub nut until the assembly begins to snug up in the bore of the drive arm and
the shaft of the sample pelican.
2. Measure the “B” dimension and position the rod clevis on the air cylinder so that the “A” dimension
is the same as the “B” measurement less 1/2'' of the stroke.
3. The rod threads on the air cylinder will need to be shortened if they protrude inside the clevis and hit
the drive arm. Lock clevis in place by tightening the jam nut.
4. Check the position of the drive arm on the shaft with the alignment of the sample pelican. The air
cylinder must remain parallel to the top of the housing as it extends and retracts. Retract the air
cylinder and check that the sample cutter seals under the dust seal. Extend the air cylinder and
check the opposite seal.
5. Tighten the torque hub nut with a torque wrench to the value shown on the table below.
Sampler Size
Shaft Size
Nut Size
Installation Torque On Nut
GRA-6 and GRA-10
1-1/4"
1-3/4''
1800 In./Lbs. (150 Ft./Lbs.)
GRA-14 and GRA-18
1-1/2"
2.00''
2100 In./Lbs. (175 Ft./Lbs.)
GRA-22 and GRA-26
1-15/16"
2-1/2''
3500 In./Lbs. (290 Ft./Lbs.)
