PI-0833

Service Program
Trucks
Mack Trucks, Inc.
Greensboro, NC USA
SB-10054127-5422
Date
Group
No.
Release
Page
10.2013
563
001
1
1(3)
PI0833, Tractor Protection Valve (TPV) Fitting
CHU, CXU, GU
PI0833, Tractor Protection Valve (TPV) Fitting
(October 2013)
Some units without hand control valves have been built with a double check valve installed to
the TPV. This is a misbuild and the double check valve needs to be removed for proper
operation of the trailer brake system. Build date range 1/4/2013 to 6/19/2013.
Repair Procedure
You must read and understand the precautions and guidelines in Service Information,
Group 50, “General Safety Practices, Brake and Air Systems” before performing this
procedure. If you are not properly trained and certified in this procedure, ask your
supervisor for training before you perform it.
1 Park the vehicle on a flat level surface, apply the parking brake, and place the shift lever in
neutral (manual transmission) or Park (automatic transmission). Turn the ignition key to the
OFF position.
2 Completely drain the air system.
W5084980
3 Locate the tractor protection valve (TPV) at the rear of the cab and remove the double
check valve (DC-4) from the rear of it.
Note: Discard valve and fittings.
4 Tie back or remove smaller 9.5 mm (3/8 in.) airline.
5 Remove fitting from TPV and discard.
6 Install new fitting 8397724 into the TPV.
PV729-PI0833
USA62005
Mack Trucks, Inc.
Service Program
Date
10.2013
Group
No.
Release
563
001
1
W5084981
Note: Use pipe sealant to ensure air tight connection.
7 Install the 13 mm (1/2 in.) airline into the new fitting 8397724.
W5084982
8 Start the engine and build air pressure until system is completely charged.
Page
2(3)
Mack Trucks, Inc.
Service Program
Date
10.2013
Group
No.
Release
563
001
1
Reimbursement
This repair is covered by an authorized Service Program. Reimbursement is
obtained via the normal claim handling process.
Claim Type (used only when uploading from the Dealer Bus.
Sys.)
B
Recall Status
Vehicle inspected, repair not required
1- Inspected OK
Vehicle repaired per instruction
2- Modified per
instruction
Labor Code
Primary Labor Code
5333C-01-96
0.3 hrs
Time to take charge and determine campaign status
101AA–0A–00 —
0.3 hrs.
Causal Part
25110484
Parts Disposition
Authorization Number
PI0833
Expiration Date
31 OCTOBER
2014
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3(3)