CARRIER-PLANETARY 7G7218 - Caterpillar

Introduction
The following test procedure will check the pressure of the charge oil that is being delivered from a modulating valve (transmission) to a transmission clutch. There are nine individual modulating valves that control the nine transmission clutches. The modulating valves (transmission) are modulated. The modulation of these valves can be adjusted.Required Tools
Illustration 1 g00800009
Tooling (K)
Use the tools in Table 1 to complete the following test procedure.
Table 1
Required Tools (Pressure Gauges)
Tool Item Part Number Description Qty
K K1 6V-3989 Fitting (Test) 2
K2 8T-0855 Pressure Gauge 2
K3 177-7861 Hose As 2
K4 6V-4143 Coupler 4
143-4065 Pressure Sensor
0 to 6895 kPa (0 to 1000 psi) 1 Test Procedure
Sudden movement of the machine or release of oil under pressure can cause serious injury to persons on or near the machine.To prevent possible injury, perform the procedure that follows before testing and adjusting the hydraulic system.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the machine. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Dispose of all fluids according to local regulations and mandates.
Pressure gauges are used in the following test procedure.
Illustration 2 g01325496
Transmission Clutches
The designated letters are used to correlate a modulating valve to the corresponding transmission clutch, as shown.
Illustration 3 g01322698
Modulating Valves (Transmission)
Each modulating valve has a designated letter, as shown. The letters have been cast into the transmission housing.Log the clutch pressures in Table 2. There are always two clutches that are engaged for each gear selection. NEUTRAL position only uses one clutch. See Table 2 in order to determine the clutches that are engaged for each gear selection.
Table 2
Checklist for Transmission Clutch Pressures
Gear Clutch or Valve Pressure Measurement Clutch or Valve Pressure Measurement
Fourth gear (reverse) A J
Third gear (reverse) A H
Second gear (reverse) A B
First gear (reverse) A G
Neutral J - -
First gear C G
Second gear D G
Third gear E G
Fourth gear F G
Fifth gear C B
Sixth gear C H
Seventh gear D B
Eighth gear D H
Ninth gear E B
Tenth gear E H
Eleventh gear F B
Twelfth gear F H
Thirteenth gear C J
Fourteenth gear D J
Fifteenth gear E J
Sixteenth gear F J
Make sure that the transmission control lever is in the PARK position.
Warm the oil to a minimum temperature of 60°C (140°F). Third gear that uses clutches (E) and (G) is shown in the following test:
Connect one end of Tooling (K) to the test port on valve (E). Connect one end of a second Tooling (K) to the test port on valve (G).
Operate the transmission in third gear at high idle.
Observe the pressure that is being delivered to transmission clutches (E) and (G). You can use Table 2 to write down the measurement.
Stop the engine.
Repeat Steps 3 through 6 for the remaining reverse gears and forward gears. Use Table 2 in order to determine the combination