Chevrolet Tracker 1998 User Manual
3 shift control valve, acting against the spring and governor oil
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Detent Downshift, Valves in Second Gear
With the selector lever in the Drive position, detent downshifts are possible by fully depressing the
accelerator pedal. This causes the mechanical linkage to the detent valve to move the detent valve,
cutting off modulator oil to the 3-2 control valve, the 1-2 shift control valve, the 1-2 accumulator valve
and the 2-3 shift control valve.
The mechanical linkage holding the detent valve open allows the detent regulated oil to pass into the
detent oil passage and is directed to the 2pressure. It is also directed to the 3-2 control valve, acting against the spring, allowing detent oil to pass
through the valve and act on the end of the 2-3 shift control valve to keep the valve bottomed in its bore
against governor oil pressure. Second clutch oil at the 2-3 shift valve is closed off from passing into the
third clutch passages by the detent oil pressure holding the 2-3 shift valve bottomed in its bore.
Summary
The second is clutch on, the low band is on. The valves are in Second Gear position under detent
conditions.
FIGURE Detent Downshift, Valves in Second Gear Position(c)
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Drive Range, First Gear
When the selector lever is moved to the Drive position on the quadrant, the manual valve is positioned
to allow line oil to enter the drive circuit and is directed to the 1-2 shift valve, the governor, the 1-2
ccumulator valve and the high speed downshift timing valve.
The drive oil directed to the 1-2 accumulator valve is regulated and directed to fill the bottom portion of
the accumulator. The drive oil also passes through an orifice at the high speed downshift timing valve
and passes through the valve to apply the low band servo. Drive oil at the governor is regulated to a
variable pressure which increases with vehicle speed and acts on the ends of the 1-2, 2-3 shift valves,
high speed downshift timing valve, and the vacuum modulator valve.
Summary
The clutches are off, the low band is applied, the transmission is in Drive Range - First Gear.
FIGURE Drive Range, First Gear(c)
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accumulator. As the upper portion of the accumulator fills with second clutch oil, it overcomes the lesser
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Drive Range, Second Gear
As the vehicle increases speed, the governor allows more drive oil to pass through, and this increased
pressure, acting on the end of the 1-2 shift valve, overcomes the 1-2 shift valve spring pressure and
allows drive oil to pass through the valve to feed the second clutch oil passages.
Second clutch oil passes through the second clutch orifice control valve, and is metered to the second
clutch piston to begin to apply the second clutch, while a portion of the oil is directed to the
pressure of 1-2 accumulator oil and spring at the bottom of the accumulator piston, forcing the piston
downward. The upper portion of the accumulator is now filled, allowing full oil pressure to the second
clutch piston for the final apply. The accumulator, therefore, acts as a reservoir to produce a damping
effect for a smooth second clutch apply and the 1-2 shift.
Second clutch oil from the 1-2 shift valve is simultaneously directed to the 2-3 shift valve to be used as
the oil source for the 2-3 shift.
Summary
The second clutch is on, the band is on, the transmission is in Drive Range - Second Gear.
FIGURE Drive Range, Second Gear(c)
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3 shift valve. This allows the second clutch oil at the 23 shift valve to be released and pass through the
pressure. The oil passes through the valve and is directed to the top of the low band servo, to act with the
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Drive Range, Third Gear
As vehicle speed increases, the governor allows more oil to pass through, to act against the spring at the
2valve as third clutch oil, directed to the third clutch piston to apply third clutch. At the same time, third
clutch oil is directed to the 3-2 control valve, acting against the spring and modulator oil, cutting off
modulator oil pressure to the 2-3 shift control valve. Third control oil also is directed to the Reverse and
Low control valve and passes through the valve as servo release oil to the low speed downshift timing
valve. The low speed downshift timing valve is held open against the spring by increased modulator oil
servo piston spring and force the servo piston downward, releasing the low band.
Servo release oil is also directed from near the low reverse control valve through an orifice to the
converter clutch control valve and the solenoid area. Oil will bleed out through the solenoid until the
governor pressure (and vehicle speed) closes the governor switch. The solenoid is then energized to
close the bleed and oil pressure can now move the converter clutch valve to apply the TCC.
Summary
The second clutch is on, the third clutch is on, the band is released. The transmission is in Drive Range Third Gear, and as speed increases the TCC is applied.
FIGURE Drive Range, Third Gear(c)
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2 shift
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Manual First Gear
When the selector lever is moved to the Low position on the quadrant, the manual valve is positioned to
allow drive oil, intermediate oil and low oil to pass through the valve. Low oil is directed to the 1valve train which acts with the 1-2 valve spring against governor oil pressure to close off drive oil from
passing into the second clutch passage. At the same time, low oil is directed to the reverse and low
control valve and acts against the spring to allow detent regulated oil at the reverse and low control
valve to flow to the 2-3 shift valve, which is bottomed in its bore by intermediate oil pressure and the
valve spring. The detent oil passes through the 2-3 shift valve and into the third clutch passages to apply
the third clutch and to close off modulator oil pressure from the 3-2 control valve to the 2-3 shift control
valve. Third control oil is also directed to the reverse and low control valve, which is held open against
its spring by low oil pressure, and closes off the source of supply to the servo release passage, to allow
the servo to apply the low band. Intermediate oil seats the check ball at the reverse passage at the
pressure regulator boost valve cavity and continues to the pressure regulator valve to increase oil
pressure in the circuit.
Summary
The third clutch is on, the band is on. The transmission is in Manual First.
FIGURE Manual First Gear(c)
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Manual Second Gear
The selector lever is moved to the Intermediate position on the quadrant, the manual valve is positioned
to allow drive oil and intermediate oil to pass through the valve. Intermediate oil is directed to the
pressure regulator boost control cavity, seating the check ball at the reverse passage. Intermediate oil is
then directed to the pressure regulator valve downward to increase the oil pressure in the circuit. At the
same time, the intermediate oil from the manual valve is directed to the 2-3 shift valve train closing off
the supply of third clutch oil in the circuit, which is exhausted through the reverse and low control valve.
Summary
With third clutch oil exhausted, the third clutch is off, the second clutch is on, the low band servo is
applied. The transmission is in Manual Second.
FIGURE Manual Second Gear(c)
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2 accumulator valve, and the
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Park or Neutral - Engine Running
Whenever the engine is running with the selector in Neutral, oil is pulled from the sump into the oil
pump and is dispensed from the pump under pressure. Line oil is directed to the vacuum modulator
valve, to the pressure regulator valve and to the manual valve. The converter is fed through the pressure
regulator valve, the return oil from the converter being directed through the cooler and back into the
transmissions lubricating system.
Line oil directed to the vacuum modulator valve becomes regulated to modulator oil and acts on the
pressure regulator boost valve, the low speed downshift timing valve, the 1detent valve. The modulator oil passes through the detent valve to act on the 1-2 shift control valve, the
3-2 control valve and the 2-3 shift control valve. Line oil passes through the manual valve, and is
regulated at the detent pressure regulator valve before being directed to the Reverse and Low control
valve.
Summary
The converter is filled, the clutches and low band are released. The transmission is in Park or Neutral.
FIGURE Park or Neutral - Engine Running(c)
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When the selector lever is moved to the Reverse position on the quadrant, the manual valve is positioned
to allow reverse oil to pass through the manual valve into the reverse oil passage. The reverse oil applies
3 shift valve. The detent regulated oil passes
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Reverse
the reverse clutch. At the same time, reverse oil is directed to the pressure regulator boost control valve
cavity to seat the check ball and prevent reverse oil passing into the intermediate oil passage. It is then
directed to the pressure regulator boost valve forcing the pressure regulator valve downward to increase
oil pressure in the circuit.
Reverse oil is also directed to act on the end of the reverse and low control valve against the spring to
allow detent regulated oil to pass through the valve to the 2through the 2-3 shift valve and into the third clutch oil passages to apply the third clutch. The third
clutch oil also acts on the end of the 3-2 control valve against the spring and modulator oil pressure,
closing off the supply of modulator oil to the 2-3 shift control valve. Third clutch oil at the reverse and
low control valve is closed off from passing through the valve, and into the servo release passage.
Summary
The reverse clutch is on and the third clutch is on. The transmission is in Reverse Range.
FIGURE Reverse(c)
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FIGURE Component Locator View(c)
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(1) Torque Converter Housing
(2) Converter Clutch Torque Converter
(3) Oil Pump
(4) Case
(5) Second Clutch
(6) Third Clutch
(7) Planetary Gear Set
(8) Reaction Sun Gear Assembly
(9) Low Band
(10) Governor Assembly
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(11) Extension Housing
(12) Speedometer Drive Gear
(13) Governor Hub
(14) Parking Pawl
(15) Parking Lock Actuator
(16) Oil Pan
(17) Servo Cover
(18) Reaction Sun Gear
(19) Input Sun Gear
(20) Sprag Assembly
(21) Control Valve Assembly
(22) Detent Lever and Actuator Rod
(23) Manual Valve and Link
(24) Reverse Clutch Piston
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FIGURE Case and Associated Parts (1 of 2)(c)
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(201) Converter Assembly
(202) Bolt, Converter Housing to Oil Pump
(203) Bolt, Converter Housing to Case
(204) Seal, Converter Housing
(205) Housing, Converter
(207) Gasket, Oil Pump
(208) Plate, Oil Pump Wear
(209) Gear Pump Driven
(210) Gear Pump Drive
(211) Pin, Oil Pump Boost Sleeve Retainer
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(212) Sleeve, Oil Pump Boost
(213) Valve, Oil Pump Boost
(214) Seat, Pressure Regulator Valve Spring
(214) Seat, Pressure Regulator Valve Spring
(215) Spring, Pressure Regulator Valve
(216) Valve, Pressure Regulator
(217) Valve, Clutch Control
(218) Spring, Clutch Control Valve
(219) Plug, Clutch Control Valve
(220) Pin, Clutch Control Valve
(222) Body, Oil Pump
(223) Seal, Oil Pump (Outer)
(224) Washer, Selective Thrust
(225) Ring, 2nd Clutch Oil Seal
(226) Seal, Reverse Clutch Piston (Inner)
(227) Seal, Reverse Clutch Piston (Outer)
(228) Piston, Reverse Clutch
(229) Spring, Clutch Piston Return
(230) Seat, Reverse Clutch Piston Return Spring
(231) Ring, Clutch Piston Ring Seat Retainer
(232) Plate, Reverse Clutch Cushion
(233) Plate, Reverse Clutch (Flat Steel)
(234) Plate, Reverse Clutch (Lined)
(236) Plate, Reverse Clutch Pressure
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FIGURE Case and Associated Parts (2 of 2)(c)
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(101) Case, Transmission
(105) Connector, Electrical Assembly
(108) Spring, Detent Valve
(109) Seat, Spring Detent Valve
(110) Valve, Detent
(111) Sleeve, Detent Valve
(112) Pin, Detent Valve
(113) Seal, Detent Valve Sleeve
(114) Sleeve, Modulator Valve
(115) Valve, Modulator
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(116) Plunger, Modulator
(117) Seal, Modulator
(118) Modulator, Vacuum Assembly
(119) Case Extension Housing
(121) Spring, Parking Lock Pawl
(122) Pawl, Parking Lock
(123) Actuator, Parking Lock Pawl
(125) Seal Assembly, Case Extension Oil
(126) Gasket, Case Extension to Case
(127) Bolt, Case Extension to Case
(128) Control Valve Body Assembly
(129) Gasket, Spacer Plate
(130) Plate, Spacer
(132) Gasket, Spacer Plate to Case
(137) Switch, Governor Pressure
(138) Valve, Manual
(139) Link, Manual Valve
(140) Lever, Detent
(141) Shaft, Manual
(142) Seal, Manual Shaft
(143) Pin, Manual Shaft
(144) Nut, Manual Shaft
(145) Roller, Detent
(146) Plate, Reinforcement
(147) Solenoid and Bracket Assembly
(148) Wiring Harness
(149) Pipe, Solenoid to Valve Body
(150) Pipe, Solenoid to Oil Pump
(151) Seal, Solenoid Pipe
(152) Bolt, Servo Cover and Reinf. Plate
(152) Bolt, Servo Cover and Reinf. Plate
(152) Bolt, Servo Cover and Reinf. Plate
(153) Gasket, Transmission Oil Filter
(154) Filter, Transmission Oil
(155) Bolt, Control Valve Body Assembly to Case
(155) Bolt, Control Valve Body Assembly to Case
(155) Bolt, Control Valve Body Assembly to Case
(156) Spring, Servo Piston Return
(157) Rod, Servo Piston Apply
(158) Sleeve, Servo Piston Adjusting
(159) Retainer, Servo Piston Cushion Spring
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(160) Seat, Servo Piston Cushion Spring
(161) Spring, Servo Piston Cushion
(162) Piston, Servo
(163) Ring, Servo Piston Seal
(164) Screw, Servo Piston Adjusting
(165) Nut, Servo Piston Adjusting Screw
(166) Piston Assembly, Servo
(167) Ring, Servo Piston Retainer
(168) Gasket, Servo Piston Cover
(169) Cover, Servo Piston
(170) Gasket, Transmission Oil Pan
(171) Magnet, Transmission Oil Pan
(172) Pan, Transmission Oil
(173) Bolt, Transmission Oil Pan to Case
(176) Switch, Oil Pressure
(183) Washer
(184) Clips
(185) Vent, Rear
(193) Ball, Check
(601) Seal, Speedometer Driven Gear Guide
(602) Gear, Speedometer Driven
(603) Guide, Speedometer Driven Gear
(604) Bushing, Speedometer Driven Gear Guide
(605) Bolt, Speedometer Driven Gear Bracket
(606) Washer, Speedometer Driven Gear Bracket
(607) Bracket, Speedometer Driven Gear Guide
(608) Clip, Retaining
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FIGURE Control Valve Body Assembly(c)
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(138) Valve, Manual
(139) Link, Manual Valve
(500) Body, Control Valve
(501) 1-2 Accumulator Piston Assembly
(502) Pin, Retaining
(502) Pin, Retaining
(502) Pin, Retaining
(502) Pin, Retaining
(502) Pin, Retaining
(502) Pin, Retaining
(502) Pin, Retaining
(502) Pin, Retaining
(503) Plug, 1-2 Accumulator Valve
(504) Valve, 1-2 Accumulator
(505) Spring, 1-2 Accumulator Valve
(506) Spring, Downshift timing valve (High Speed)
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(507) Valve, Downshift timing (High Speed)
(509) Valve, Downshift timing (Low Speed)
(510) Spring, Downshift timing Valve (Low Speed)
(511) Spring, Manual Low Control Valve
(512) Valve, Manual Low Control
(513) Valve, Reverse Control
(514) Valve, 1-2 Shift
(515) Spring, 1-2 Shift Control Valve
(516) Valve, 1-2 Shift Control
(517) Spring, 1-2 Shift Control Valve
(518) Sleeve, 1-2 Shift Control Valve
(519) Valve, 2-3 Shift
(520) Seat, 2-3 Shift Control Valve Spring
(521) Spring, 2-3 Shift Control Valve
(522) Valve, 2-3 Shift Control
(523) Sleeve, 2-3 Shift Control Valve
(524) Valve, 3-2 Control
(525) Spring, 3-2 Control Valve
(526) Plug, 3-2 Control Valve
(527) Valve, Detent Pressure Regulator
(528) Spring, Detent Pressure Regulator Valve
(530) Valve, Intermediate
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FIGURE Second Clutch Assembly(c)
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(229) Spring, Clutch Piston Return
(303) Drum, 2nd Clutch
(304) Seal, 2nd Clutch Piston (Inner)
(305) Seal, 2nd Clutch Piston (Outer)
(306) Piston, 2nd Clutch
(308) Seat, 2nd Clutch Piston Spring Retainer
(309) Ring, Clutch Piston Spring Seat Retainer
(311) Plate, 2nd Clutch (Waved)
(312) Plate, 2nd Clutch (Lined)
(313) Plate, 2nd Clutch (Steel)
(314) Spacer, 2nd Clutch
(315) Ring, Ring Gear Retainer
(315) Ring, Ring Gear Retainer
(316) Gear, Ring
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