© SPX FLOW, Inc.
Form No. 1000623
Rev. 6 Jan. 10, 2017
7. See Figure 21. Clean and inspect the piston
assembly for wear/damage. It is not necessary to
remove the piston rod from the piston.
8. Clean and inspect the cylinder bore for scoring,
pitting and damage that could impair the sealing
ability and replace/repair as necessary.
9. Remove and discard the endcap seal. Clean
and inspect the endcap ensuring the threads are
checked for damage.
Repair Procedures continued
1
2
3
Item
Description
1
Seal
2
Piston
3
Piston Rod
Figure 21. Piston Assembly
Hydraulic Cylinder/Body Assembly
NOTE: All seals should be new and lubricated with clean hydraulic oil or seal assembly paste
before installation.
1. Assemble a new rod seal into the body. Assemble a new piston seal onto the piston ensuring the seal
backup ring scarved joints are rotated 180° apart.
2. With the seals and bores coated in clean hydraulic oil, insert the piston into the body bore, guiding/
aligning the piston through the rod seal during installation. Ensure the piston backup rings are not
dislodged during installation.
3. Install a new o-ring seal onto the endcap and install it into the body. Tighten the endcap using a pin
spanner.
4. Assemble the drive components as described in section ‘Drive Component Assembly’.
5. Replace the guard.
6. Test the operation of the torque wrench by connecting to the appropriate pump unit. Keeping hands
clear of the wrench, advance and retract the wrench several times ensuring the drive mechanism
functions correctly. Apply full pressure to the wrench (690 bar/10,000 psi advance; 103 bar/1500 psi
retract), and check for leaks.
Following stripdown and/or lubrication, the hydraulic torque wrench should be calibrated to verify that
the torque output is within specification.