Danfoss PVG 32 Service Manual

Failure mode Cause Corrective action
Will not build pressure in A or B
work port
Contamination preventing shuttle ball from
building load sense relief pressure
Replace complete PVB module
LS A, B shuttle
Shuttle
ball
P107 821
Main spool
Description: Main directional control.
Location: PVB (valve section) module.
Function: Controls oil flow from pump to work ports A or B.
Failure mode Cause Corrective action
Section will not build pressure in one
spool direction
Load sense passages in spool are blocked Flush out load sense passages in the spool. Spool will need to be
removed to clean
Main valve spool stuck in valve body
(if being used with electrical
actuator)
Refer to Pressure reducing valve Replace PVM and PVE. Be sure that pilot valve is assembled
correctly.
Mechanical actuator main valve
spool stuck in valve body
Hard particle binding spool in bore
Look down into the A and B work ports to see if the particle can
be removed while the spool is in the valve body. Replace valve
section.
NOTE: Valve body and spool will need to be replaced per valve
specifications
Main spool stuck in valve body Tie rod over torqued Replace tie rod kit which includes section seals and torque to 28
Nm [248 lbf•in]
Valve stack mounting surface is not flat
causing a bind on the valve stack
Ensure the mounting surface is flat*
* Flatness in millimeters - T= 0.35 mm X number of PVB modules + 1
Serviceability: Main spool is serviceable depending on failure mode.
1. Remove manual actuator using a 5 mm internal hex wrench to remove the 4 mounting screws.
CAREFULLY place the main spool in to an appropriate fixture or vice with card board, rubber hose or
heavy shop towels on the jaws and tighten just enough to keep the spool from turning in the vice.
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 using a 13 mm open end wrench.
3. Remove the plug at the other end 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.
Service Manual
PVG 32 Proportional Valve Group
PVG 32 Component Troubleshooting
28 |
©
Danfoss | February 2017 11039167 | AX00000031en-US0301

Danfoss PVG 32 Specifications

General

Category	Control Unit
Maximum working pressure	350 bar
Size	32
Type	Proportional Valve
Maximum operating pressure	420 bar
Porting pattern	ISO 4401
Electrical connection	AMP