Danfoss PVG 100 Service Manual page 28

Service Manual
PVG 100 Component Troubleshooting
28
PVG 100 Proportional Valves
Serviceability: Main spool is serviceable depending on failure mode.
1. Remove manual actuator (not shown) using a 5 mm internal hex wrench to remove the four
mounting screws. Pull the spool out of the valve body.
CAREFULLY place the main spool in to an appropriate fixture or vice with cardboard, rubber hose or
heavy shop towels on the jaws and tighten just enough to keep the spool from turning in the vice.
W
Warning
DO NOT over tighten the main spool in the vice as it will be distorted and or scratched on sealing
lands and the spool will need to be replaced.
2. Remove the tension rod end (6) using a 13 mm open end wrench.
3. Remove the plug at the other end (2, 9, 10) using an 11 mm, or if it has a detent option, use a 12 mm
open end wrench.
4. Flush out openings into the main spool cavity at each end.
5. Install plug (6) with a 11 mm or 12 mm open end wrench. Torque to 8 Nm [70 lbf•in].
6. Install centering spring and tension rod (7, 5, 8, 11, 3, 6, ) using a 13 mm open end wrench and torque
to 8 Nm [70 lbf•in].
7. Lubricate and carefully insert main valve spool into valve housing. Do not force the main spool back
into the housing as you will damage the sealing lands in the valve housing. The spool should move
freely in the main spool bore when installed.
8. Install a manual actuator (not shown). Reassemble in reverse order and torque the four mounting
screws to 8 Nm [70 lbf•in]
If section does not build pressure in one direction, wrong spool may have been installed in valve.
11048807 • Rev BA • October 2014