Whirlpool TU 4100 Owner's Manual download pdf (Page 28)

Repair Guide - Switching Valve Overhaul

Doc # 99-5846-A

The switching valve can be overhauled to correct

external seal leakage only — not bypass. If any of the

major components require replacement, the entire

valve will need to be replaced.

If the switching valve is a lot hotter than the other

hydraulic components during operation then a large

amount of oil is being bypassed. Send the switching

valve to Hallco for testing or replace the valve

entirely.

Remove the cap screws which attach the end caps

to the valve body.

Disassembling the Switching Valve

Rear End Cap

Valve Body

Pilot Rod

(Qty 4)

Cap Screw 3/8" NC x 2.1/2"

# 81-2529

(Qty 2)

*Shaft Wiper

(Qty 2)

*O-Ring, Size 2-210

1/4" NPT Plug

# 85-3489

Forward End Cap

*Indicates Contents of Switching Valve Seal Kit

# 50-2709

Valve Spool

(Qty 2)

*O-Ring, Size 2-136

(Qty 5)

*O-Ring, Size 2-117

*O-Ring Pair, Size 2-214

# 50-2847

Slide the end caps away from the valve body.

Remove the pilot rod and the spool.

Remove the o-rings and shaft wipers.

Inspecting the Switching Valve Components

Inspect the spool, pilot rod, spool bore, and pilot rod

bores for scoring and burrs.

Inspect all the remaining seal areas. The seal areas

must be smooth and free of scoring and burrs.

Inspect the fasteners and threaded holes for good thread

engagement.

Reassembly of the Switching Valve

Hallco recommends replacing all the switching valve

seals when overhauling the switching valve.

Lubricate the shaft wipers and o-rings with hydraulic fluid

and install them in the end caps.

Lubricate the valve spool and pilot rod with hydraulic fluid

and insert the spool into the valve body and the pilot rod

into the spool. Center them on the valve body.

Place the o-rings which go between one of the end caps

and the body in their respective seal grooves and slide on

the end cap. Note the location of the alignment pin.

Repeat for the other end cap.

Install the cap screws which hold the forward end cap on,

snug them up, then torque them to 30 ft-lbs [41 N-m].

Use two of the same size cap screws to hold the rear end

cap snug until it is ready to be installed on the hydraulic

module.

Complete Switching Valve Assembly #56-3964

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Whirlpool TU 4100 Owner's Manual Page 28

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