CX31-P600 Petroleum Transmission Power Train Pressures Caterpillar




Illustration 1	g03476165
Typical example of a CX31–P600 Petroleum Transmission (shown without integral pump drives) (1) Transmission lubrication pressure coupler (2) Lockup clutch pressure coupler (3) Clutch #1 (C1) pressure coupler (4) Clutch #2 (C2) pressure coupler (5) Clutch #3 (C3) pressure coupler (6) Clutch #4 (C4) pressure coupler (7) Clutch #5 (C5) pressure coupler (8) Filter inlet pressure coupler (S·O·S port) (9) Filter outlet pressure coupler (10) Converter inlet pressure port

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Table 1
CX31-P600 Power Train Pressures
Pressure Taps	Description	Low Idle⁽¹⁾	High Idle⁽²⁾
(1)	Transmission lubrication pressure	20 ± 12 kPa (3 ± 1.7 psi)	275 ± 40 kPa (40 ± 6 psi)
(2-3)	Pressure for the transmission lockup clutch and clutch number 1	1840 ± 150 kPa (267 ± 22 psi)	2150 ± 170 kPa (312 ± 25 psi)
(4)	Pressure for the transmission clutch number 2	1700 ± 150 kPa (247 ± 22 psi)	2010 ± 170 kPa (292 ± 25 psi)
(5-7)	Pressure for the transmission clutches number 3, 4, and 5	1900 ± 100 kPa (276 ± 15 psi)	2240 ± 140 kPa (325 ± 20 psi)
(8)	Pressure for the transmission pump outlet and transmission filter inlet	1915 ± 125 kPa (278 ± 18 psi)	2365 ± 175 kPa (343 ± 25 psi)
(9)	Relief pressure for the transmission hydraulic control	1895 ± 125 kPa (275 ± 18 psi)	2250 ± 85 kPa (326 ± 12 psi)
(10)	Relief pressure for the torque converter inlet	150 ± 50 kPa (22 ± 7 psi)	670 ± 70 kPa (97 ± 10 psi)

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⁽¹⁾	Specified Value at 60° C (140° F) Sump Temperature and at 600 rpm
⁽²⁾	Specified Value at 60° C (140° F) Sump Temperature and at 2100 rpm

Power Train Pressures with Retarder

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Illustration 2	g03476201
Typical example of a CX31–P600 Petroleum Transmission (shown without integral pump drives) (1) Transmission lubrication pressure coupler (2) Lockup clutch pressure coupler (3) Clutch #1 (C1) pressure coupler (4) Clutch #2 (C2) pressure coupler (5) Clutch #3 (C3) pressure coupler (6) Clutch #4 (C4) pressure coupler (7) Clutch #5 (C5) pressure coupler (8) Filter inlet pressure coupler (S·O·S port) (9) Filter outlet pressure coupler (10) Converter inlet pressure coupler (11) Retarder outlet pressure coupler (retarder valve) (12) Torque converter outlet pressure coupler (retarder valve) (13) Retarder inlet pressure coupler (retarder valve) (14) Lubrication pressure coupler (retarder valve) (15) Retarder activation pressure coupler

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Table 2
CX31-P600 Power Train Pressures with Retarder
		Retarder Off	Retarder On	Retarder On
Pressure Taps	Description	High Idle⁽¹⁾	Low Idle⁽²⁾	High Idle⁽¹⁾
(1)	Transmission lubrication pressure coupler	265 ± 65 kPa (38 ± 9 psi)	31 ± 14 kPa (4.5 ± 2 psi)	207 ± 69 kPa (30 ± 10 psi)
(2-3)	Pressure for the transmission clutch number 1	2150 ± 170 kPa (312 ± 25 psi)	1840 ± 150 kPa (267 ± 22 psi)	2150 ± 170 kPa (312 ± 25 psi)
4	Pressure for the transmission clutch number 2	2010 ± 170 kPa (292 ± 25 psi)	1700 ± 150 kPa (247 ± 22 psi)	2010 ± 170 kPa (292 ± 25 psi)
5-7	Pressure for the transmission clutches number 3, 4, and 5	2240 ± 140 kPa (325 ± 20 psi)	1900 ± 100 kPa (276 ± 15 psi)	2240 ± 140 kPa (325 ± 20 psi)
(8)	Pressure for the transmission pump outlet and transmission filter inlet	2400 ± 175 kPa (348 ± 25 psi)	1915 ± 125 kPa (278 ± 18 psi)	2400 ± 175 kPa (348 ± 25 psi)
(9)	Relief pressure for the transmission hydraulic control	2270 ± 85 kPa (329 ± 12 psi)	1895 ± 125 kPa (275 ± 18 psi)	2270 ± 85 kPa (329 ± 12 psi)
(10)	Relief pressure for the torque converter inlet	805 ± 185 kPa (117 ± 27 psi)	814 ± 138 kPa (118 ± 20 psi)	1000 ± 138 kPa (145 ± 20 psi)
(11)	Retarder outlet pressure coupler (retarder valve)	0	827 ± 138 kPa (120 ± 20 psi)	1110 ± 138 kPa (161 ± 20 psi)
(12)	Torque converter outlet pressure coupler (retarder valve)	500 ± 115 kPa (73 ± 17 psi)	772 ± 138 kPa (112 ± 20 psi)	745 ± 138 kPa (108 ± 20 psi)
(13)	Retarder inlet pressure coupler (retarder valve)	0	786 ± 138 kPa (114 ± 20 psi)	758 ± 138 kPa (110 ± 20 psi)
(14)	Lubrication pressure coupler (retarder valve)	265 ± 65 kPa (38 ± 9 psi)	31 ± 14 kPa (4.5 ± 2 psi)	207 ± 69 kPa (30 ± 10 psi)
(15)	Retarder activation pressure coupler	0	896 ± 69 kPa (130 ± 10 psi)	786 ± 138 kPa (114 ± 20 psi)

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⁽¹⁾	Specified Value at 80° C (176° F) Sump Temperature and at 2100 rpm
⁽²⁾	Specified Value at 80° C (176° F) Sump Temperature and at 600 rpm

Power Train Pressures with Output Transfer Gear

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Illustration 3	g03102476
Drop Box (20) Transmission output speed sensor (21) Work mode output speed sensor (22) Test port (work mode disengage pressure) (23) Rear wheel drive fork position sensor (24) Test port (rear wheel drive engage pressure) (25) Work mode output yoke (26) Test port (work mode engage pressure) (27) Work mode fork position sensor (28) Test port (rear wheel drive disengage pressure) (29) Rear wheel drive disconnect speed sensor (30) Rear wheel drive output yoke (31) Test port (front wheel drive engage pressure) (32) Test port (front wheel drive disengage pressure) (33) Test port (filter outlet pressure and drop box lube pressure) (34) Front wheel drive disconnect speed sensor (35) Drop box oil filter (36) Drop box mounting pad

2WD and 4WD Units

The output transfer gear drop box maintains the same output speeds (constant 1:1 ratio) as the transmission output while providing for the ability to transfer the power flow between multiple output yokes for both stationary use by a work tool and vehicle propulsion. These pressures show a low to high acceptable limit along with the respective rpm variations.

Test information "2WD"

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Table 3
All Information taken at High Idle 1900 rpm
CX31-P600 with Output Gear
Description	Low Limit	Nominal	High Limit
Drop Box Lube Pressure	34	42	50
TOS Sensor (Workover Mode)	410	455	501
TOS Sensor (Road Mode)	772	858	944
Engage Road (Two-Wheel Drive) Mode with lowest selectable Transmission gear engaged
CX31-P600 with Output Gear
Description	Low Limit	Nominal	High Limit
RWD Engage Pressure	200	250	300
RWD Disengage Pressure	0	0	0
RWD TOS Sensor	772	858	944
RWD Position Sensor	80%	85%	90%

Work Mode Engage Pressure	0	0	0
Work Mode Disengage Pressure	200	250	300
Work Mode TOS Sensor	0	0	0
Work Mode Position Sensor	10%	15%	20%

Engage Workover Mode with the lowest selectable Transmission gear engaged
Description	Low Limit	Nominal	High Limit
RWD Engage Pressure	0	0	0
RWD Disengage Pressure	200	250	300
RWD TOS Sensor	0	0	0
RWD Position Sensor	10%	15%	20%

Work Mode Engage Pressure	200	250	300
Work Mode Disengage Pressure	0	0	0
Work Mode TOS Sensor	410	455	501
Work Mode Position Sensor	80%	85%	90%

Test information "4WD"

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Table 4
All Information taken at High Idle - 1900 rpm
CX31-P600 with Output Gear
Description	Low Limit	Nominal	High Limit
Drop Box Lube Pressure	34	42	50
TOS Sensor (Work Over Mode)	410	455	501
TOS Sensor (Road Mode)	772	858	944
Engage Road (2WD) Mode with lowest selectable Transmission gear engaged
CX31-P600 with Output Gear
Description	Low Limit	Nominal	High Limit
RWD Engage Pressure	200	250	300
RWD Disengage Pressure	0	0	0
RWD TOS Sensor	772	858	944
RWD Position Sensor	80%	85%	90%

FWD Engage Pressure	0	0	0
FWD Disengage Pressure	200	250	300
FWD TOS Sensor	0	0	0
FWD Position Sensor	10%	15%	20%

Work Mode Engage Pressure	0	0	0
Work Mode Disengage Pressure	200	250	300
Work Mode TOS Sensor	0	0	0
Work Mode Position Sensor	10%	15%	20%

Engage Workover Mode with lowest selectable Transmission gear engaged
CX31-P600 Drop Box
Description	Low Limit	Nominal	High Limit
RWD Engage Pressure	0	0	0
RWD Disengage Pressure	200	250	300
RWD TOS Sensor	0	0	0
RWD Position Sensor	10%	15%	20%

Work Mode Engage Pressure	200	250	300
Work Mode Disengage Pressure	0	0	0
Work Mode TOS Sensor	410	455	501
Work Mode Position Sensor	80%	85%	90%

Engage Road and AWD Mode with lowest selectable Transmission gear engaged.
CX31-P600Drop Box
Description	Low Limit	Nominal	High Limit
RWD Engage Pressure	200	250	300
RWD Disengage Pressure	0	0	0
RWD TOS Sensor	772	858	944
RWD Position Sensor	80%	85%	90%

FWD Engage Pressure	200	250	300
FWD Disengage Pressure	0	0	0
FWD TOS Sensor	772	858	944
FWD Position Sensor	80%	85%	90%

Work Mode Engage Pressure	200	250	300
Work Mode Disengage Pressure	0	0	0
Work Mode TOS Sensor	0	0	0
Work Mode Position Sensor	10%	15%	20%

Transmission Gear Ratios and Clutch Assignments

The CX31-P600 transmission has six forward gears and one reverse gear. The gear ratios and the clutch assignments are shown in the following table.

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Table 5
CX31-P600 Transmission Clutch Assignments
Operation	Gear Ratios	CLUTCHES					Transmission Output Speed at 800 RPM Input with LUC Engaged (RPM)	Transmission Output Speed at 2200 RPM Input with LUC Engaged (RPM)
Operation	Gear Ratios	1	2	3	4	5
Neutral						O	−	−
1 Forward	4.40	O				O	182	500
2 Forward	2.33	O			O		343	943
3 Forward	1.53	O		O			522	1435
4 Forward	1.00	O	O				800	2200
5 Forward	0.72		O	O			1114	3062
6 Forward	0.61		O		O		1315	3617
Reverse	-3.97			O		O	202	554
Park	-				O	O	-	-
Warm-up	-			O	O	O	-	-