631G and 637G Wheel Tractor-Scrapers Machine Systems Caterpillar

Load Cylinder - Remove and Install

Usage:

637G CEH

Removal Procedure

Show/hide table

Table 1
Required Tools
Tool	Part Number	Part Description	Qty
A	8S-8048	Saddles	2
	8S-7630	Stands	2
	8S-7625	Collars	2
	8S-7641	Tubes	2
	8S-7650	Cylinder Assemblies	2
	4C-5809	Electric Hydraulic Pump Gp	1
B	9U-7536	Lift Stand	2
B	4C-5809	Electric Hydraulic Pump Gp	1
C	2G-2827	Block	2
		Bolt (3/4 by 10)	2
		Nut (3/4 by 10)	2
D	155-3597	Wheel Chock	4
E	5H-4020	Cover	2
	4J-0522	O-Ring Seal	2
	1P-4578	Half Flange	4
F	138-7574	Link Bracket	1
G	6V-3160	Double Acting Cylinder	1
	9S-5564	Pin Puller Sleeve As	1
	3S-6224	Electric Hydraulic Pump Gp	1
	4C-9633	Puller Stud	1
	9U-6833	Nut	1
H	138-7573	Link Bracket	1
J	140-7742	Sleeve	1

Show/hide table

Cylinders equipped with lock valves can remain pressurized for very long periods of time, even with the hoses removed.
Failure to relieve pressure before removing a lock valve or disassembling a cylinder can result in personal injury or death.

Ensure all pressure is relieved before removing a lock valve or disassembling a cylinder.

Show/hide table

Personal injury can result from hydraulic oil pressure and hot oil.
Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system.

Make sure all of the work tools have been lowered to the ground, and the oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand.

Show/hide table

NOTICE

Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Caterpillar Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Caterpillar products. Dispose of all fluids according to local regulations and mandates.

Show/hide table

NOTICE

Keep all parts clean from contaminants. Contamination of the hydraulic system with foreign material will reduce the service life of the hydraulic system components. To prevent contaminants from entering the hydraulic system, always plug or cap the lines, fittings, or hoses as they are disconnected. Cover any disassembled components and clean them properly before assembly. Clean the hydraulic system properly after any major component exchange or especially after a component failure, to remove any contamination.

Note: Put identification marks on all hoses, on all hose assemblies, on all wires, and on all tube assemblies for installation purposes. Plug all hose assemblies and all tube assemblies. This helps to prevent fluid loss, and this helps to keep contaminants from entering the system.

Show/hide table




Illustration 1	g01083210

Install Tooling (C) to cushion-hitch (1). Tooling (C) must prevent all movement of the cushion-hitch.

Show/hide table




Illustration 2	g01083219

Use Tooling (A) in order to support draft frame (2) .

Show/hide table




Illustration 3	g01083224

Use Tooling (B) in order to support the tractor.

Show/hide table




Illustration 4	g01083228

Install Tooling (D). Install suitable cribbing under power train guard (3) .

Remove the accumulators. Refer to Disassembly and Assembly, "Accumulator (Cushion-Hitch) - Remove".

Remove the leveling valve. Refer to Disassembly and Assembly, "Leveling Valve - Remove".

Show/hide table




Illustration 5	g01083232

Remove nut (4) and disconnect servo steering cylinder (5) from the steering link. Remove bolts (6) and position cylinder bracket (7) out of the way. Disconnect grease hose assemblies (10). Remove bolts (9) and remove retainer (8) .

Show/hide table




Illustration 6	g01083287

Disconnect hose assemblies (11). Use Tooling (E) in order to cap the ports. The ports must be capped properly in order to prevent any movement of the cylinder rod. Remove bolts (13) and remove lever assembly (12). Disconnect grease hose assembly (14) .

Show/hide table




Illustration 7	g01083307

Disconnect hose assemblies (15). Disconnect grease hose assemblies (16) .

Show/hide table




Illustration 8	g01083312

Disconnect hose assemblies (17). Disconnect clamp (18) .

Show/hide table




Illustration 9	g01083315

Disconnect grease hose assembly (20). Remove bolts (19) and remove retainer (21) .

Show/hide table




Illustration 10	g01083319
Right Side

Install Tooling (F) and a suitable lifting device. The suitable lifting device must secure the upper link assembly to the hitch assembly. Install a suitable lifting device to Tooling (G). Install Tooling (G) to pin (23) (not shown). The weight of Tooling (G) and pin (23) (not shown) is approximately 60 kg (130 lb). Remove pin (23). Remove thrust washers (22) .

Show/hide table




Illustration 11	g01083324
Left Side

Install a suitable lifting device to Tooling (G) . Install Tooling (G) to pin (25). The weight of pin (25) and Tooling (G) is approximately 60 kg (130 lb). Remove pin (25). Remove thrust washers (24) .

Show/hide table




Illustration 12	g01083534
Left Side

Install a suitable lifting device to upper link assembly (26). Remove Tooling (F) and the suitable lifting device. Remove upper link assembly (26). The weight of upper link assembly (26) is approximately 110 kg (240 lb).

Show/hide table




Illustration 13	g01083329

Install Tooling (H) to fender (27). Install a suitable lifting device to Tooling (H). Remove fender (27). The weight of fender (27) is approximately 120 kg (260 lb).

Show/hide table




Illustration 14	g01083356

Install a suitable lifting device and Tooling (J) to load cylinder (28). The weight of load cylinder (28) is approximately 130 kg (280 lb).

Show/hide table




Illustration 15	g01083350

Install a suitable lifting device to Tooling (G). Install Tooling (G) to lower pin (30) (not shown). The weight of pin (30) and Tooling (G) is approximately 60 kg (130 lb). Remove lower pin (30) (not shown). Remove thrust washer (29) (not shown). Remove load cylinder (28) .

Disassembly and Assembly Information

Show/hide table

Table 2
Required Tools
Tool	Part Number	Part Description	Qty
K	127-4904	Repair Stand	1
L	195-4609	Seal Pick	1
M	5P-0960	Molybdenum Grease	-
N	4C-4032	Bearing Mount Compound	-

Show/hide table

Ensure all pressure is relieved before removing a lock valve or disassembling a cylinder.

Show/hide table

NOTICE

Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Caterpillar Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Caterpillar products. Dispose of all fluids according to local regulations and mandates.

Show/hide table




Illustration 16	g01034323

(1) Apply Tooling (M) to the nut. Tighten the nut to a torque of 2720 ± 272 N·m (2006 ± 201 lb ft).

(2) Tighten the bolts when the rod is fully extended.

(3) Lubricate the sealing lips lightly with the lubricant that is being sealed.

(4) Apply Tooling (N) to the wiper seal groove prior to assembly.

Installation Procedure

Show/hide table

Table 3
Required Tools
Tool	Part Number	Part Description	Qty
A	8S-8048	Saddles	2
	8S-7630	Stands	2
	8S-7625	Collars	2
	8S-7641	Tubes	2
	8S-7650	Cylinder Assemblies	2
	4C-5809	Electric Hydraulic Pump Gp	1
B	9U-7536	Lift Stand	2
B	4C-5809	Electric Hydraulic Pump Gp	1
C	2G-2827	Block	2
		Bolt (3/4 by 10)	2
		Nut (3/4 by 10)	2
D	155-3597	Wheel Chock	4
E	5H-4020	Cover	2
	4J-0522	O-Ring Seal	2
	1P-4578	Half Flange	4
F	138-7574	Link Bracket	1
G	6V-3160	Double Acting Cylinder	1
	9S-5564	Pin Puller Sleeve As	1
	3S-6224	Electric Hydraulic Pump Gp	1
	4C-9633	Puller Stud	1
	9U-6833	Nut	1
H	138-7573	Link Bracket	1
J	140-7742	Sleeve	1

Show/hide table




Illustration 17	g01083356

Install a suitable lifting device and Tooling (J) to load cylinder (28). Position load cylinder (28) to the machine. The weight of load cylinder (28) is approximately 130 kg (280 lb).

Show/hide table




Illustration 18	g01083350

Install a suitable lifting device to Tooling (G). Install Tooling (G) to lower pin (30) (not shown). The weight of pin (30) and Tooling (G) is approximately 60 kg (130 lb). Install thrust washer (29) (not shown). Install lower pin (30) .

Show/hide table




Illustration 19	g01083329

Install Tooling (H) to fender (27). Install a suitable lifting device to Tooling (H). Install fender (27). The weight of fender (27) is approximately 120 kg (260 lb).

Show/hide table




Illustration 20	g01083534
Left Side

Install a suitable lifting device to upper link assembly (26). Install upper link assembly (26). The weight of upper link assembly (26) is approximately 110 kg (240 lb).

Show/hide table




Illustration 21	g01083324
Left Side

Install a suitable lifting device to Tooling (G). Install Tooling (G) to pin (25). The weight of pin (25) and Tooling (G) is approximately 60 kg (130 lb). Position thrust washers (24). Install pin (25) .

Show/hide table




Illustration 22	g01083319
Right Side

Install Tooling (F) and a suitable lifting device. The suitable lifting device must secure the upper link assembly to the hitch assembly. Install a suitable lifting device to Tooling (G). Install Tooling (G) to pin (23) (not shown). The weight of Tooling (G) and pin (23) (not shown) is approximately 60 kg (130 lb). Install thrust washers (22). Install pin (23) .

Show/hide table




Illustration 23	g01083315

Position retainer (21) and install bolts (19). Connect grease hose assembly (20) .

Show/hide table




Illustration 24	g01083312

Connect clamp (18). Connect hose assemblies (17).

Show/hide table




Illustration 25	g01083307

Connect hose assemblies (15). Connect grease hose assemblies (16) .

Show/hide table




Illustration 26	g01083287

Connect grease hose assembly (14). Position lever assembly (12) and install bolts (13). Remove Tooling (E) and connect the hose assemblies (11) .

Show/hide table




Illustration 27	g01083232

Position retainer (8) and install bolts (9). Connect grease hose assemblies (10). Position cylinder bracket (7) and install bolts (6). Position servo steering cylinder (5) and install nut (4) .