GMC T Series 1994 Repair Manual page 734

PUMP ASSEMBLY
Figure 70
Tools Required:
J 23129 Seal Remover
J 6125-IB Slide Hammer
Disassemble
1. Five bolts (220).
CAUTION: Regulator spring (230) is tightly
compressed. Use care when removing
retaining ring (226). Personal injury could
result.
2. Retaining ring (226).
3. Pressure regulator and boost valve assemblies
(227, 232 and 238).
4. Converter limit valve assembly, pin (211), plug
(212), spring (213) and valve (214).
5. Torque converter clutch enable valve assembly,
sleeve (215), spring (216) and valve (217).
6. Torque converter clutch valve assembly, snap ring
(221), plug (222), valve (223), spring (224), plug
(225) and pin (211).
7. Inspect markings on gear faces and chamfer of
gear teeth, before removing gears (204) and (205)
from pump body, to ensure gears were installed
correctly.
8. Pump drive gear (205) and driven gear (204).
9. Seal rings (219) and selective thrust washer (218).
10. Seal ring (5) pump to case.
Pump Body
Figure 70
| y | Inspect
1. Gear pockets, crescent, pump body face, and
bushing for:
• Scoring.
• Nicks.
• Wear.
2. Oil passages for:
• Foreign material or debris.
• Porosity.
• Scored or irregular mating surfaces.
• Cross channel leaks.
3. Pump body bolt threads for:
• Damage.
4. Oil seal (201), bushing (202) for:
• Wear.
• Damage.
Pump Cover
F ig u re 70
[ y | Inspect
1. Pump gear face for:
• Wear.
• Scoring.
2. Stator shaft splines for:
• Damage or stripped splines.
3. Stator shaft bushings (233) and (234) for:
• Wear.
• Galling.
4. Oil ring grooves for:
• Nicks.
• Burrs.
• Debris.
5. Pressure regulator assembly, converter limit valve
assembly, TCC enable valve assembly and TCC
valve assembly for:
• Free movement of valves in bores.
• Chips.
• Burrs.
• Distortion.
• Plugged oil passages.
6. Breather hole in pump cover blocked.
Clean
• All components.
Pump Assembly
Fig u res 70, 71 a n d 72
[H I Measure
• For proper gear clearance install pump gears (204
and 205) in body (203) as marked. Chamfer side
down.
• Measure clearance between gears and body with
straight edge and feeler gage.
- Maximum clearance 0.017 to 0.071 mm
(0.0007 to 0.0028 inch.).
• Pump body with straight edge to insure flatness.
| ^ | Assemble
h
1. Drive gear (205) and driven gear (204) with
identification marks facing up. Outside diameter
chamfer side down on gear teeth (Figure 71).
• Install driven gear (204) into body.
• Lubricate drive gear (205) and driven gear
(204) w ith DEXRON®-IIE autom atic
transmission fluid.
• Install drive gear into pump body (203) with
flats facing up.