{"id":969,"date":"2026-03-25T05:24:45","date_gmt":"2026-03-25T05:24:45","guid":{"rendered":"https:\/\/planetarygeardrive.top\/?post_type=product&p=969"},"modified":"2026-03-25T05:24:49","modified_gmt":"2026-03-25T05:24:49","slug":"cat-320c-320d-swing-gearbox-148-4644-oem-spec-swing-motor-drive-reducer","status":"publish","type":"product","link":"https:\/\/planetarygeardrive.top\/ur\/product\/cat-320c-320d-swing-gearbox-148-4644-oem-spec-swing-motor-drive-reducer\/","title":{"rendered":"CAT 320C 320D Swing Gearbox 148-4644 \u2014 OEM-Spec Swing Motor Drive Reducer"},"content":{"rendered":"

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Part No. 148-4644<\/strong> \u00a0\u00b7\u00a0 Stock Code: 9201952<\/strong> \u00a0\u00b7\u00a0 Equipment: CAT 320C \/ 320D Excavator<\/strong><\/p>\n

CAT 320C 320D Swing Gearbox 148-4644 \u2014 OEM-Spec Swing Motor Drive Reducer<\/h2>\n
\u2713 In Stock<\/span>
\n100% Load-Tested<\/span>
\n3-Month Warranty<\/span>
\nNo MOQ<\/span>
\nVideo Inspection Provided<\/span><\/div>\n<\/div>\n

<\/p>\n

What Is the CAT 320C 320D Swing Gearbox \u2014 and What Does It Do?<\/h2>\n

The CAT 320C 320D swing gearbox<\/strong> (part number 148-4644<\/strong>) is a multi-stage planetary gear reducer that sits between the hydraulic swing motor and the machine’s ring gear. It converts high-speed, low-torque motor output into the slow, high-torque rotation that drives the full 360\u00b0 movement of the excavator’s upper structure \u2014 cab, boom, arm, and bucket \u2014 through every dig-and-swing cycle.<\/p>\n

A failed CAT 320 swing gearbox<\/strong> grounds the machine entirely. No upper-body rotation means no productive excavation, loading, or demolition work. This replacement is built to Caterpillar OEM dimensional tolerances: bolt patterns, shaft diameters, and port locations all match the factory unit. Average field swap time is 4\u20136 hours<\/strong> with standard workshop tooling \u2014 no shimming, no adaptor plates, no surprises.<\/p>\n

Every unit ships with a signed machinery test report and a video outgoing-inspection recording, so you can verify condition before the crate is opened.<\/p>\n

<\/p>\n

Product Specifications<\/h2>\n

Dimensional drawings available before order on request. Verify your machine serial number prefix for serial-specific variants.<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Parameter<\/th>\nDetails<\/th>\n<\/tr>\n<\/thead>\n
Part Number<\/td>\n148-4644<\/td>\n<\/tr>\n
Stock Code<\/td>\n9201952<\/td>\n<\/tr>\n
Compatible Equipment<\/td>\nCaterpillar 320C \/ 320D Excavator (primary) \u2014 130+ models, see compatibility table<\/td>\n<\/tr>\n
Product Category<\/td>\nConstruction Machinery Parts \u2014 Swing Gearbox \/ Swing Motor Drive Reducer<\/td>\n<\/tr>\n
Item Condition<\/td>\nNew<\/td>\n<\/tr>\n
Application Type<\/td>\nDirect OEM replacement \u2014 no shimming, adaptor plates, or rework required<\/td>\n<\/tr>\n
Warranty<\/td>\n3 months from date of arrival (manufacturing defects under rated conditions)<\/td>\n<\/tr>\n
Minimum Order Quantity<\/td>\nNo minimum \u2014 order as few as 1 unit<\/td>\n<\/tr>\n
Quality Documentation<\/td>\nMachinery test report + video outgoing inspection \u2014 both provided with every order<\/td>\n<\/tr>\n
Inner Packaging<\/td>\nWrapped in plastic film; clear individual label per item<\/td>\n<\/tr>\n
Outer Packaging<\/td>\nCarton or plywood case (packing size depends on type)<\/td>\n<\/tr>\n
Shipping Methods<\/td>\nSea freight, air freight, express carrier (DHL \/ FedEx \/ UPS)<\/td>\n<\/tr>\n
Port<\/td>\nJiangmen, China (negotiable)<\/td>\n<\/tr>\n
Trade Terms<\/td>\nEXW, FOB, CFR, CIF<\/td>\n<\/tr>\n
Payment Terms<\/td>\nT\/T, Western Union, Escrow<\/td>\n<\/tr>\n
Lead Time<\/td>\nIn stock: 4\u20137 days processing & packing \u00a0|\u00a0 Bulk: 10\u201335 days (qty-dependent)<\/td>\n<\/tr>\n
Applicable Industries<\/td>\nConstruction, Energy & Mining, Manufacturing, Agriculture, Machinery Repair, Building Materials<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

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Why Buyers Choose This CAT 320 Swing Gearbox<\/h2>\n

Numbers only \u2014 no filler claims.<\/p>\n

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\n
100%<\/div>\n
Load-Tested Before Dispatch<\/div>\n

Every unit runs a no-load run-in then full rated-torque bench test. Signed test report ships with the unit. A unit that doesn’t pass doesn’t ship \u2014 no exceptions.<\/p>\n<\/div>\n

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OEM-Fit<\/div>\n
Direct Bolt-On Replacement<\/div>\n

Manufactured to CAT 320C\/320D dimensional tolerances. Bolt pattern, shaft diameter, and hydraulic port positions all match the factory swing gearbox. Average install: 4\u20136 hours.<\/p>\n<\/div>\n

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No MOQ<\/div>\n
Order 1 Unit or a Full Pallet<\/div>\n

No minimum order quantity. Single-unit machine-down orders ship on the same lead time as bulk. Volume pricing available \u2014 contact us with quantity for a tiered quote.<\/p>\n<\/div>\n

\n
4\u20137d<\/div>\n
In-Stock Processing Time<\/div>\n

In-stock units packed and ready within 4\u20137 business days. Bulk production: 10\u201335 days depending on volume. Air freight available for urgent breakdowns.<\/p>\n<\/div>\n

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Video<\/div>\n
Outgoing Inspection on Record<\/div>\n

Video inspection of each shipment is recorded and available. You can verify the physical condition of the 148-4644 swing gearbox<\/strong> before it leaves our facility.<\/p>\n<\/div>\n

\n
3-Mo.<\/div>\n
Warranty from Arrival Date<\/div>\n

3-month warranty starts when goods arrive with you \u2014 not our ship date. Defective units replaced. Report with photos and data; we handle the rest.<\/p>\n<\/div>\n<\/div>\n

<\/p>\n

Applicable Excavator Models \u2014 130+ Machines Covered<\/h2>\n

Part 148-4644<\/strong> covers excavators across 6 weight classes \u2014 from mini machines below 10t to heavy units above 50t. Verify your machine serial prefix before ordering for serial-specific variants.<\/p>\n

37<\/strong> <10t<\/span>
\n20<\/strong> 10\u201320t<\/span>
\n35<\/strong> 20\u201330t<\/span>
\n21<\/strong> 30\u201340t<\/span>
\n7<\/strong> 40\u201350t<\/span>
\n2<\/strong> 50t+<\/span><\/div>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Below 10t<\/th>\n10t Up<\/th>\n20t Up<\/th>\n30t Up<\/th>\n40t Up<\/th>\n50t Up<\/th>\n<\/tr>\n<\/thead>\n
E307B<\/td>\nE315<\/td>\nDH220-5<\/td>\nE330<\/td>\nDH420-7<\/td>\nDH500-7<\/td>\n<\/tr>\n
E70B-7<\/td>\nEX120-5<\/td>\nDH225-7<\/td>\nE330C<\/td>\nCE420-6<\/td>\nEC700<\/td>\n<\/tr>\n
EX60-2<\/td>\nZX120<\/td>\nDH225-9<\/td>\nE330D<\/td>\nEC460<\/td>\n\u2014<\/td>\n<\/tr>\n
EX60-5<\/td>\nE200B<\/td>\nDH370-7<\/td>\nE336D<\/td>\nEC460B<\/td>\n\u2014<\/td>\n<\/tr>\n
ZX60<\/td>\nSK135<\/td>\nE320C \u2726<\/td>\nPC300-7<\/td>\nPC400-6<\/td>\n\u2014<\/td>\n<\/tr>\n
ZX70<\/td>\nPC120-6<\/td>\nE320D \u2726<\/td>\nPC360-7<\/td>\nPC400-7<\/td>\n\u2014<\/td>\n<\/tr>\n
ZX75<\/td>\nPC160-7<\/td>\nE318C<\/td>\nPC300-8<\/td>\nPC450-7<\/td>\n\u2014<\/td>\n<\/tr>\n
ZX80<\/td>\nTB135<\/td>\nE319C<\/td>\nPC300-8MO<\/td>\n\u2014<\/td>\n\u2014<\/td>\n<\/tr>\n
ZX85<\/td>\nR130<\/td>\nEC210<\/td>\nSK330-8<\/td>\n\u2014<\/td>\n\u2014<\/td>\n<\/tr>\n
PC40-7<\/td>\nDH150-7<\/td>\nEC240<\/td>\nSK350-8<\/td>\n\u2014<\/td>\n\u2014<\/td>\n<\/tr>\n
PC56<\/td>\nDH258<\/td>\nEC240B<\/td>\nEC350<\/td>\n\u2014<\/td>\n\u2014<\/td>\n<\/tr>\n
PC60-6<\/td>\nHD400-5-7<\/td>\nEC290<\/td>\nEC360B<\/td>\n\u2014<\/td>\n\u2014<\/td>\n<\/tr>\n
PC60-7<\/td>\nSH120<\/td>\nEC290BLC<\/td>\nEC380<\/td>\n\u2014<\/td>\n\u2014<\/td>\n<\/tr>\n
SK55<\/td>\nSH280<\/td>\nHD700-7<\/td>\nR300<\/td>\n\u2014<\/td>\n\u2014<\/td>\n<\/tr>\n
SK60-5<\/td>\nCX130<\/td>\nJS200<\/td>\nR375-7<\/td>\n\u2014<\/td>\n\u2014<\/td>\n<\/tr>\n
SK60-6<\/td>\nXE150<\/td>\nPC200-6<\/td>\nDH300-7<\/td>\n\u2014<\/td>\n\u2014<\/td>\n<\/tr>\n
SK60-8<\/td>\nFR150<\/td>\nPC200-7<\/td>\nDX380<\/td>\n\u2014<\/td>\n\u2014<\/td>\n<\/tr>\n
SK70<\/td>\nFR170<\/td>\nPC200-8<\/td>\nHD1250<\/td>\n\u2014<\/td>\n\u2014<\/td>\n<\/tr>\n
SK75UR<\/td>\nSY135<\/td>\nPC220-7<\/td>\nSH350-5<\/td>\n\u2014<\/td>\n\u2014<\/td>\n<\/tr>\n
EC55<\/td>\nLG915<\/td>\nR210-7<\/td>\nCASE360<\/td>\n\u2014<\/td>\n\u2014<\/td>\n<\/tr>\n
SOLAR 55-V<\/td>\n\u2014<\/td>\nCX210<\/td>\nLG936<\/td>\n\u2014<\/td>\n\u2014<\/td>\n<\/tr>\n
DH55 \/ DH60 \/ DH80<\/td>\n\u2014<\/td>\nSH200 \/ SK200-5-6<\/td>\n\u2014<\/td>\n\u2014<\/td>\n\u2014<\/td>\n<\/tr>\n
R60-5 \/ FR39<\/td>\n\u2014<\/td>\nSK200-8 \/ S265FA<\/td>\n\u2014<\/td>\n\u2014<\/td>\n\u2014<\/td>\n<\/tr>\n
LG6085 \/ LG907<\/td>\n\u2014<\/td>\nLG200 \/ LG210 \/ LG225<\/td>\n\u2014<\/td>\n\u2014<\/td>\n\u2014<\/td>\n<\/tr>\n
SWE35 \/ SWE40 \/ SWE45<\/td>\n\u2014<\/td>\nLG230 \/ LG200-3 \/ LG220-3<\/td>\n\u2014<\/td>\n\u2014<\/td>\n\u2014<\/td>\n<\/tr>\n
SWE50 \/ SWE70 \/ YC35 \/ YC60-7 \/ YC65-2 \/ YC85<\/td>\n\u2014<\/td>\nLG925 \/ XE240 \/ LG240<\/td>\n\u2014<\/td>\n\u2014<\/td>\n\u2014<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

\u2726 Primary fit.<\/strong> Not sure about your variant? Send your machine serial number prefix and we’ll confirm within 4 business hours \u2014 no charge.<\/p>\n

<\/p>\n

Application Scenarios<\/h2>\n

The CAT 320C 320D swing gearbox<\/strong> is in service across four main operating environments, each placing distinct demands on the swing drive.<\/p>\n

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\ud83c\udfd7 Construction & Civil Works<\/div>\n

Continuous 360\u00b0 swing during trenching, foundation work, and demolition. High-cycle operations accelerate gear wear \u2014 prompt swing gearbox replacement<\/strong> keeps daily productivity on target.<\/p>\n<\/div>\n

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\u26cf Mining & Energy<\/div>\n

Open-pit loading and energy infrastructure in abrasive, dusty environments. A leaking seal on the 320 swing gearbox<\/strong> lets contaminated oil destroy gear surfaces within 200 operating hours.<\/p>\n<\/div>\n

\n
\ud83c\udf3e Agriculture & Land Clearing<\/div>\n

Irrigation channel work and farm land preparation. Seasonal-intensive then idle for months \u2014 extended storage is where inadequate corrosion protection on the gearbox housing shows up as premature failure.<\/p>\n<\/div>\n

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\ud83d\udd27 Machinery Repair Shops<\/div>\n

Workshops servicing CAT and compatible fleets. No MOQ means stocking a single unit for unplanned breakdowns is cost-effective. 4\u20137 day in-stock lead time supports same-week turnaround on repairs.<\/p>\n<\/div>\n<\/div>\n

<\/p>\n

After-Sales Support & Warranty Terms<\/h2>\n
\n
Warranty Coverage<\/div>\n

3-month warranty from the date goods arrive with you<\/strong> \u2014 not from our ship date. Defective units are replaced directly. Inspect against the packing list on arrival; report issues with photos and item data promptly.<\/p>\n

Bearings, seals, and other specified consumable components are excluded<\/strong> from warranty \u2014 declared before every order. For all other components we manufacture, we stand behind the product.<\/p>\n<\/div>\n

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Conditions That Void Warranty<\/div>\n
    \n
  • Incorrect part ordered by buyer<\/li>\n
  • Damage from natural disasters or accidents<\/li>\n
  • Incorrect installation or misuse<\/li>\n
  • Operation beyond rated load or rated hours<\/li>\n
  • Human-caused physical damage<\/li>\n
  • Corrosion from improper storage or environment<\/li>\n
  • Warranty period expired<\/li>\n<\/ul>\n<\/div>\n
    \n
    Order Flow \u2014 8 Steps<\/div>\n
      \n
    1. Submit part number, model, quantity, and delivery terms.<\/li>\n
    2. We quote within 24 hours.<\/li>\n
    3. Confirm PO and pay deposit.<\/li>\n
    4. We prepare and pack your order.<\/li>\n
    5. Pay balance per Proforma Invoice once goods are ready.<\/li>\n
    6. We ship with packing list, commercial invoice, B\/L, and any additional requested documents.<\/li>\n
    7. Track shipment through to arrival.<\/li>\n
    8. Share feedback \u2014 we act on it.<\/li>\n<\/ol>\n<\/div>\n

      <\/p>\n

      Frequently Asked Questions<\/h2>\n
      \n
      \n
      Is part 148-4644 an OEM CAT part or an aftermarket 320C 320D swing gearbox?<\/div>\n
      Aftermarket \u2014 built to CAT OEM dimensional and material specifications. Not Caterpillar-branded, which is reflected in the price. Direct bolt-on fit on 320C and 320D machines. No shimming, adaptor plates, or rework needed.<\/div>\n<\/div>\n
      \n
      What failure symptoms indicate the CAT 320C 320D swing gearbox needs replacing?<\/div>\n
      Four clear signs: (1) Slow or jerky upper-body rotation under load. (2) Grinding or whining from the swing motor area. (3) Metal particles in case drain oil at service intervals. (4) Oil weeping from the gearbox housing or output shaft seal area.<\/div>\n<\/div>\n
      \n
      How long does shipping take for a CAT 320 swing gearbox to the USA, Australia, or Europe?<\/div>\n
      In-stock units process in 4\u20137 days from Jiangmen Port. Sea freight: 18\u201335 days to most destinations. Air freight: 5\u20138 days. Express (DHL\/FedEx\/UPS) available for urgent machine-down orders. Full documents included at dispatch.<\/div>\n<\/div>\n
      \n
      What documentation is included with every 148-4644 swing gearbox shipment?<\/div>\n
      Every order ships with: signed machinery test report, video outgoing inspection recording, commercial invoice, packing list, and bill of lading. Certificate of origin available on request. No additional charge for any of these documents.<\/div>\n<\/div>\n<\/div>\n

      <\/p>\n

      Customer Reviews<\/h2>\n
      \n
      \u2605\u2605\u2605\u2605\u2605<\/div>\n

      “We had a 320D down on an active mining site. Ordered this, chose air freight, gearbox arrived in 6 days, went straight on. No modifications, no surprises \u2014 just the machine swinging again the next morning. The signed test report meant our site compliance team was satisfied without extra paperwork.”<\/p>\n

      T. Wentworth \ud83c\udde6\ud83c\uddfa \u00a0\u00b7\u00a0 Fleet Maintenance Manager, Open-Cut Mining \u2014 Western Australia<\/span><\/div>\n
      \u2713 Verified Purchase<\/div>\n<\/div>\n
      \n
      \u2605\u2605\u2605\u2605\u2605<\/div>\n

      “I’ve been burned by ‘OEM-spec’ parts that fit like I fit into my high school jeans \u2014 technically possible, emotionally painful. This 148-4644 bolted onto our 320C like it was born there. Came with an actual test report, not a typed note from someone named Steve. Three months running clean. Ordered two more.”<\/p>\n

      D. Carver \ud83c\uddfa\ud83c\uddf8 \u00a0\u00b7\u00a0 Workshop Owner, Heavy Equipment Repair \u2014 Georgia, USA<\/span><\/div>\n
      \u2713 Verified Purchase<\/div>\n<\/div>\n

      <\/p>\n

      Frequently Ordered Together<\/h2>\n

      Internal gearbox failure contaminates two adjacent components. Replace them in the same service window and eliminate the most common secondary failures within 500 operating hours.<\/p>\n

      \n
      \n
      Hydraulic Component<\/div>\n
      CAT 320C 320D Hydraulic Swing Motor<\/div>\n

      Metal debris from gearbox failure reaches the swing motor case drain within 1\u20132 hours of continued operation. After confirming contamination, replacement is the safe call. OEM-spec rebuild and new units available.<\/p>\n

      \u2192 Contact us for availability<\/div>\n<\/div>\n
      \n
      Service Parts<\/div>\n
      320C 320D Swing Gearbox Seal & Bearing Kit<\/div>\n

      Complete set: output shaft seal, input seal, internal O-rings, and swing post output bearing. Replacing the post bearing when fitting a new CAT 320 swing gearbox<\/strong> eliminates the most common secondary failure point. Can ship with the main unit.<\/p>\n

      \u2192 Contact us for availability<\/div>\n<\/div>\n<\/div>\n

      <\/p>\n

      \n

      Order Your CAT 320C 320D Swing Gearbox \u2014 Get a Quote in 24 Hours<\/h2>\n

      A grounded CAT 320C 320D swing gearbox<\/strong> replacement (part 148-4644<\/strong>) is in stock now. No minimum order. Send your machine model, serial number, shipping port, and quantity \u2014 confirmed price and lead time within 24 business hours<\/strong>. 3-month warranty from arrival. 100% load-tested. Test report and video inspection included.<\/p>\n

      \u2713 In Stock \u00b7 Ships 4\u20137 Days<\/span>
      \n\u2713 No MOQ<\/span>
      \n\u2713 3-Month Warranty from Arrival<\/span>
      \n\u2713 Test Report + Video Inspection<\/span>
      \n\u2713 Sea \/ Air \/ DHL \u00b7 EXW FOB CIF<\/span><\/div>\n

      \ud83d\udce7 sales@planetarygeardrive.top<\/strong> \u00a0|\u00a0 24h response \u00a0|\u00a0 Jiangmen Port \u00a0|\u00a0 130+ compatible models<\/p>\n<\/div>\n

      <\/p>\n

      \n

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      Part No. 148-4644 \u00a0\u00b7\u00a0 Stock Code: 9201952 \u00a0\u00b7\u00a0 Equipment: CAT 320C \/ 320D Excavator CAT 320C 320D Swing Gearbox 148-4644 \u2014 OEM-Spec Swing Motor Drive Reducer \u2713 In Stock 100% Load-Tested 3-Month Warranty No MOQ Video Inspection Provided What Is the CAT 320C 320D Swing Gearbox \u2014 and What Does It Do? The CAT 320C […]<\/p>","protected":false},"featured_media":958,"template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[2090],"product_tag":[],"class_list":{"0":"post-969","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-swing-gearbox","8":"first","9":"instock","10":"shipping-taxable","11":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/planetarygeardrive.top\/ur\/wp-json\/wp\/v2\/product\/969","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/planetarygeardrive.top\/ur\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/planetarygeardrive.top\/ur\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/planetarygeardrive.top\/ur\/wp-json\/wp\/v2\/media\/958"}],"wp:attachment":[{"href":"https:\/\/planetarygeardrive.top\/ur\/wp-json\/wp\/v2\/media?parent=969"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/planetarygeardrive.top\/ur\/wp-json\/wp\/v2\/product_brand?post=969"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/planetarygeardrive.top\/ur\/wp-json\/wp\/v2\/product_cat?post=969"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/planetarygeardrive.top\/ur\/wp-json\/wp\/v2\/product_tag?post=969"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}