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Tractor Stack Valve Modifications S/N 398796 & Down
Load Sense Bleed Off
Adjustment valve
Factory Set
Plastic Plug
Passage Hole
Shuttle Check Disk
Load Sense
Figure 1
Tractor Stack Valve Modifications: S/N 398796 Dec. 2003 and down
The LH End Plate of the Tractor Stack Valve must be replaced. This applies to units with S/N
398796 Dec. 2003 and down only. For trators with later S/N and Date see the end of this section for
installation of the new RH end plate.. CHECK which Valve & S/N you have before starting this
assembly. The original Stack valve does not have the Load Sense Port or the Load Sense Bleed Off
Adjustment Valve. These are required to make the Machete Control Valve Hydraulic systems operate
using the Tractor Hydraulic Source. Shown above in Figure 1 is a drawing of the replacement LH End Plate
for the Stack Valve, The replacement part is furnished as part of the mount kit
The replacement of this end plate is critical; the method of changing the end plate is critical. It is
recommended that you read this entire section before starting any work as you can damage the Stack
Valve and Tractor Hydraulic System if this is not done correctly. There are some things that must be done.
1.
The area around the Stack Valve must be Clean. No dirt, Paint chips or anything that would
contaminate the hydraulic system can not be present.
2.
The Stack Valve must never be unbolted unless the Valve has been clamped together to prevent
any pieces from slipping apart or getting mis-aligned. There are small metal disks between
sections that must not be allowed to slip out of place, The replacement end plate has a metal
disc that must be in place.
3.
All Hoses and fitting must be clean, before installing any Hoses or fittings clean them with clean
filtered compressed air. Watch for any metal shavings that would splinter off of a threaded part
or hole. Remove any that are found. Do not let any Thread Sealer, Pieces of O-Rings or Gaskets
enter system it will plug and damage system.
Machete (JD -62,63,6420 Asy Man) 10/04
© 2004 Alamo Group Inc.
Replacement LH Stack Valve End Plate
Port Plug
Section 5 - 2
O-Ring (Large Round
Shaped)
O-Ring (Installed in
Square Shape)
Passage Hole
O-Ring (installed in tear
Drop Shape)
O-Ring (Small & Round
Shape)
S/N 398796 Dec. 2003
and down
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