TM-5-3805-254-14-P-2

TRUCK, DUMP, 20 TON, 6X4, ON-OFF HIGHWAY 71,000 GVW, IHC MODEL F-5070 (CCE)

TECHNICAL MANUAL; OPERATOR’S, ORGANIZATIONAL, DIRECT SUPPORT, GENERAL SUPPORT AND DEPT MAINTENANCE MANUAL (INCLUDING REPAIR PARTS INFORMATION AND SUPPLEMENTAL MAINTENANCE INSTRUCTIONS)

JUNE 1980
TM-5-3805-254-14-P-2

  TM-5-3805-254-14-P-2 - Page 163 of 894

TRUCK SERVICE MANUAL
Fig. 4.
Sectional View of Type PB
Two-Way Control Valve
Legend for Fig.
4
Key
Description
Key
Description
1
CAP, Valve End
8
NUT, Mounting
2
GASKET, End Cap
9
O-RING STEM,
3
NUT, Valve Stem
Center (5/16" or
4
O-RING, Piston
10
STEM, Valve
(1/2" OD)
11
O-RING STEM,
5
PISTON
Front (3/8" OD)
6
BODY
12
NUT, Lock
7
PLATE, Name
13
KNOB
MAINTENANCE
Once each year or every 100, 000 miles the valve
should be removed, disassembled and repair kit
installed.
SERVICE CHECKS
Normal usage tests will provide good checks
for valve.
However, it should be checked periodically as
follows.
Air leaks (disregarding normal exhaust) may appear
at exhaust port.
Nominal leakage of slow bubbling of
soap will have little consequence in most systems.
A
leak at exhaust port when valve is applied indicates
exhaust seal leaking.
If leakage occurs at stem end (at control knob) of
valve, stem seal is leaking.
If leakage is noted the valve
must be removed and either replaced or repaired
REMOVE
Refer to Fig.
4 for numbers in parenthesis.
1. Loosen lock nut (12) and remove knob (13).
Lock nut can now be removed.
2. Disconnect air lines at valve.
3. Loosen and remove valve mounting nut (8); then
name plate (7); then remove valve.
INSTALL
1. Position valve through instrument panel.
2. Install name plate and mounting nut.
3. Connect air lines; then install control knob lock
nut and knob.
Tighten lock nut against knob to
secure it.
NOTE:
Prior to returning vehicle to
service,
perform SERVICE CHECKS as
outlined.
DISASSEMBLY
Refer to Fig.
4 for numbers in parenthesis.
1. Remove end cap (1) and gasket (2).
2. Remove valve stem nut (3).
To remove nut
install two nuts on opposite end of stem (10)
locking stem.
Use a wrench at each end of stem
to loosen stem nut (3).
3. Pull stem (10) from body (6).
4. Remove piston (5) from body.
CLEANING AND INSPECTION
Wash all metal parts in good cleaning solvent.
Inspect body for nicks or burrs in bore of valve.,
Replace
complete valve assembly if body is not considered
serviceable.
Use new parts supplied in repair kit.
161
BRAKES-AIR


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