El crecimiento de TikTok

a. Clutches, Pistons

1. When assembling a clutch pack, soak friction-faced clutch plates in transmission fluid for at least two minutes and install each plate so that any cone is in the same direction as the cone of the adjacent plates.

2. Apply a generous amount of transmission fluid to the piston cavity prior to final assembly.

b. Parts Lubrication. During final assembly, lubri-cate all moving parts with transmission fluid. The lu-bricant will help protect the friction surfaces and fer-rous metals until the unit is in service.

DRIVEN GEAR DRIVE GEAR

STRAIGHT EDGE

THICKNESS GAUGE PUMP BODY

V00779

DRIVE GEAR DRIVEN GEAR

PUMP BODY

V00780

GENERAL OVERHAUL INFORMATION

c. External Plugs, Hydraulic Fittings

CAUTION:

• Installing a pipe fitting or plug into a straight-thread port will not provide a leak-tight joint and will damage the O-ring sealing surface.

While damaged NPTF ports can often be re-paired in place by chasing the damaged port with the appropriate size pipe tap, more precise machining is required for damaged straight-thread ports. To avoid damage to the port and sealing surface, confirm the compatibility of the plug or fitting to the port before installation of the plug or fitting.

• Tighten all plugs to the torque specified in the assembly step and on the exploded views. Inac-curate torque can cause leakage and cracked housings. Straight-thread O-ring plugs and fit-tings require different installation torques than NPTF plugs and fittings. Refer to Table 4–3 for a comparison of torque specifications.

1. Later model transmissions and spare parts have SAE straight-thread O-ring pressure taps, drain plugs, and hydraulic plugs and fittings. Earlier model transmissions and spare parts have ta-pered-thread NPTF pipe taps.

2. Determine the type of plug or fitting required before installation. Refer to Figure 4–12 for identification of plugs and fittings. Refer to the current Parts Catalog PC1860EN when order-ing plugs and fittorder-ings for your transmission.

3. New Precoated Plugs. New plugs that are pre-coated with Teflon^® need no preparation for assembly.

4. Reused or Uncoated Plugs, Hydraulic Fit-tings. Prepare the threads with a small amount of nonhardening sealant, such as Loctite^® Pipe Sealant with Teflon^®, or equivalent. Do not use Teflon^® tape.

Figure 4–12. Identification Plug and Pipe Threads

Table 4–3. Torque Specifications for Straight-Thread and NPTF Fittings

Fitting Description

NPTF Tapered-

Thread Fitting Size (inch)

Torque for NPTF Tapered-Thread Fittings

O-ring, Straight-

Thread Fitting Size (inch)

SAE

#

Torque for SAE Straight- Thread Fittings English

(lb ft)

Metric

(N.m) English Metric

From-Cooler Connection 1¹⁄4 NPTF 95–105 129–142 1⁵⁄8-12 20 47–53 lb ft 64-70 N.m To-Cooler Connection 1¹⁄4 NPTF 95–105 129–142 1⁵⁄8-12 20 47–53 lb ft 64-70 N.m Converter Pressure Tap ¹⁄8 NPTF 10–12 14–16 ³⁄8-24 3 28–32 lb in. 3.2–3.6 N.m Lockup Pressure Tap ¹⁄8 NPTF 10–12 14–16 ³⁄8-24 3 28–32 lb in. 3.2–3.6 N.m Main Pressure Gauge

Connection ¹⁄4 NPTF 14–16 19–21 ⁷⁄16-20 4 38–42 lb in. 4.3–4.7 N.m Oil Filler Connection 1¹⁄4 NPTF 95–105 129–142 1⁵⁄8-12 20 47–53 lb ft 64–70 N.m Oil Level Check Plugs ¹⁄4 NPTF 14–16 19–21 ⁷⁄16-20 4 38–42 lb in. 4.3–4.7 N.m Oil Pan Drain Plug ³⁄4 NPTF 33–37 45–50 1¹⁄16-12 12 24–26 lb ft 32–35 N.m PTO Lube Pressure Tap ¹⁄4 NPTF 14–16 19–21 ¹⁄2-20 5 58–63 lb in. 6.5–7.1 N.m Remote Filter IN Port 1¹⁄4 NPTF 95–105 129–142 1⁵⁄8-12 20 47–53 lb ft 64–70 N.m Remote Filter OUT Port 1¹⁄4 NPTF 95–105 129–142 1⁵⁄8-12 20 47–53 lb ft 64–70 N.m Reverse Pressure Tap ¹⁄8 NPTF 10–12 14–16 ³⁄8-24 3 28–32 lb in. 3.2–3.6 N.m Temperature Gauge

Connection ¹⁄2 NPTF 23–27 32–36 ³⁄4-16 8 145-155 lb in. 16.3–17.5 N.m

d. Oil-Soluble Grease

Use only oil-soluble grease with a low melting point, such as MIL-W-P236 or Amojell^® petrolatum, to tem-porarily retain parts, step-joint sealrings, scarf-cut seal-rings, and hook-type sealrings during assembly with

CAUTION:

• Do not use gasket-type sealing compounds, fi-brous greases, or nonsoluble, vegetable-base cooking compounds any place inside the trans-mission or where they could be flushed into the transmission hydraulic system.

• Do not use petrolatum to retain cork gaskets.

mating parts. The oil-soluble grease will help keep the sealrings centered in their grooves and will help protect the parts from damage.

e. Sealing Compounds. If adhesives or sealers are required for the pan gasket, they may be applied on the pan mounting flange, but only in the area outside of the flange bead.

f. Lip-Type Seals (Metal-Encased)

1. When replacing metal-encased lip-type seals, make sure the spring-loaded lip side is toward the fluid to be sealed in (toward the inside of the unit). Coat the inside of the seal with high tem-perature grease, such as MIL-G-81322, Mobil

V03503.01

O-RING SEAL

(Threads provide holding power to resist pressure blowout)

SAE O-RING STRAIGHT THREAD ASSEMBLY

NPTF THREAD ASSEMBLY SAE STRAIGHT THREAD O-RING PORT

NATIONAL PIPE THREAD (NPTF) PORT

METAL-TO-METAL SEAL (Accomplished by wedging action of tapered pipe threads) FEMALE

NPTF PORT MALE NPTF PORT END FEMALE O-RING PORT SEALING

SURFACE

MALE O-RING PORT END

Grease No. 28 (Mobil Oil Co.), Aeroshell Grease No. 22 (Shell Oil Co.), or equivalent, to protect the seal during shaft installation and to provide lubrication during initial operation.

2. Precoated Seals. The circumference of some seals is precoated with a dry sealant. The seal-ant is usually colored for easy identification.

The precoated seals do not require any addi-tional sealant before installation.

3. Uncoated Seals. Prepare the circumference of uncoated seals with a nonhardening sealant be-fore installation.

g. Interference-Fit Parts. Assembly of interfer-ence-fit parts may be accomplished by heating and chilling the respective parts. The female part can be heated in an oven or oil bath to 300°F (149°C), and the male part can be chilled in dry ice. Either one or both parts may require a thermal process. However, if the chill process is used for a ferrous alloy part, coat the components with transmission fluid to inhibit rust due to frost and moisture.

h. Sleeve-Type Bearings. The use of a locking com-pound such as Loctite^® Sleeve Retainer 601, or equiv-alent, is recommended to retain bushings and sleeve-type bearings that have press-fit tolerances.

i. Bearings (Ball or Roller)

1. When installing a bearing on a shaft, heat the bearing to 200°F (93°C) on an electric hot plate or in a hot transmission fluid bath. Bear-ings must be heated long enough for sufficient expansion for installation. Heating time is de-termined by the size of the bearing. Forty-five minutes is sufficient for the largest bearing in these transmissions. Use the proper size instal-lation sleeve and a press to seat the bearing.

2. If a bearing must be removed or installed with-out a sleeve, press only on the race which is adjacent to the mounting surface. If a press is not available, seat the bearing with a drift and hammer, driving against the supported race.

CAUTION:

Do not use high temperature grease on other