CAT 3G-7013 Push Arm Bearing

CAT 3G-7013 is a Caterpillar genuine pusharm bearing assembly, compatible with the pusharm pivot of the Cat 140M/160M grader and the bucket rocker arm shaft of the 938G loader. It is an integrated assembly of double-row tapered roller bearings, including bearings, seals, spacers, and locating circlips. Its core function is to withstand bidirectional radial and axial loads under medium-speed, heavy-duty conditions, ensuring smooth rotation of the pusharm/rocker arm. The following is a professional technical and application guide:

Core Technical Parameters (Professional Version)

Item Details Basic Attributes Model 3G-7013, Type Double-row Tapered Roller Bearing Assembly (including 2 single-row tapered roller bearings + NBR double-lip seals + steel spacers + spring circlips), compatible with Cat 140M/160M grader pusharm pivot (serial number JDH1800-UP), 938G loader bucket rocker arm shaft (serial number… The KAT1000-UP bearing is made of bearing steel (GCr15SiMn, HRC 60-64), with NBR (oil-resistant, operating temperature -40℃ to +120℃) seals. It has an inner diameter of φ80 mm, an outer diameter of φ140 mm, a total width of 45 mm, a unit weight of approximately 3.2 kg, a rated static load ≥1800 kN, a rated dynamic load ≥1200 kN, a limiting speed of 2200 r/min, and a coefficient of friction ≤0.003 (grease lubrication). Key dimensions include: inner diameter tolerance 0/-0.015 mm, outer diameter tolerance 0/-0.025 mm, width tolerance ±0.15 mm, bearing clearance C3 (0.025-0.045 mm), seal lip diameter φ80 mm (pre-compression 0.15-0.20 mm), spacer thickness 10 mm (tolerance ±0.02 mm), and snap ring groove diameter. φ140 mm (width 2.5 mm), compatible shaft diameter φ80 mm (tolerance f7), mounting hole diameter φ140 mm (tolerance H7)

Material and Manufacturing Process: Bearing rings/rollers are made of GCr15SiMn bearing steel, quenched and tempered (surface hardness HRC 60-64, core hardness HRC 30-35). Rollers feature a convex design (reducing edge stress). The cage is made of stamped steel plate (phosphated surface treatment). The seal is a double-lip structure (including a dust lip + sealing lip, with an internal helical spring to hold the journal). The spacer is made of 45# steel (blackened surface treatment, flatness ≤0.01 mm).

Compatible Models: Cat 140M/160M grader push arm pivot, 938G loader bucket rocker arm shaft. The core component is used for the swing support of the push arm/rocker arm, bearing bidirectional radial load + axial thrust. Suitable for medium speeds (≤100 km/h). Under conditions of high speed (r/min) and heavy-load impact (≤25 kN), ensure the accuracy and stability of operation.

Assembly Fit: Bearings and bores are interference-fitted (interference 0.020-0.030 mm), and there is a clearance fit with the shaft (clearance 0.025-0.045 mm). The seal and journal are interference-fitted (pre-compression 0.15-0.20 mm). Rear end face runout ≤0.03 mm, radial runout ≤0.02 mm, and axial movement after snap ring installation ≤0.1 mm.

Installation and Maintenance Points: Before installation, clean the journal, mounting hole, bearing assembly, and seal. Check the bearing for rust/damage and the seal for lip cracks. Apply Cat 2V lithium-based grease to the bearing rollers and seal lip.

During assembly, first shrink the bearing (-50℃, 10 minutes), then press it into the mounting hole at a uniform speed using a special press. Next, install the spacer and seal, and finally insert the spring clip. Tighten the fixing bolts evenly in 2-3 stages (torque 120-150 N·m) to avoid localized stress that could deform the bearing or damage the seal.

Maintenance Recommendations: Check the bearing temperature (≤80℃) and seal condition every 1000 hours. If abnormal temperature rise (>80℃) or oil leakage occurs, replace the bearing assembly immediately. Replenish with Cat 2V lithium-based grease every 800 hours (approximately 0.2 kg each time) to prevent dry friction from causing bearing burnout.

Purchasing and Inventory Recommendations